How to charge batteries at home: useful to know

The Krona battery is one of the easiest sources of electricity to use. Thanks to the original terminals of this battery, polarity reversal is practically eliminated, and the rectangular elongated shape does not allow the battery to be placed inside the product differently than what was intended by the engineers.

Unfortunately, it is not always possible to purchase high-quality products. Therefore, it is necessary to learn how to choose products that will last for a long time.

Charging battery 9V 175mAh 6HR61 (Krona)

A short note on how to properly charge a Krona battery.
The name “Krona” comes from the brand of batteries of this size produced in the USSR. And now, out of inertia, all batteries of this standard size in the post-Soviet space are called “Krona”. The Krona battery consists of series-connected “aaaa” batteries. 7 pieces of nickel-metal hydride cells of 1.2V each, for a total of 8.4V. This type of battery cannot be discharged below 6.3V (each cell is at least 0.9V). I usually charge from a laboratory power supply; there are also specialized and homemade chargers.

So, this type of battery is nickel-metal hydride, therefore it must be charged with a current of 0.1 of the capacity: 175:10 = 17.5 mA. But personally, I set it to 30mA - no heating at all. Charge voltage - 10V. Charging time (hours) = Battery capacity (mAh) / Charger current (mA). Accordingly, in our case it is: 175:30 = 5.83 hours. It should be noted that everything still depends on the degree of discharge of the battery, and towards the end of charging the current decreases. Charging can be stopped as soon as the laboratory worker exits the current stabilization mode.

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Battery for recharging

The battery is only used to recharge alkaline batteries. The device has four compartments; batteries are inserted into three of them, and the battery itself is inserted into the fourth.

It is important to know how long to charge the battery; it usually lasts between five and ten minutes.

After this, you can use the batteries again, but their life will be short. It is best to take a battery with a charge indicator, which is most convenient to use.

• It is best to choose a battery with multiple battery compartments;
• The charger should turn off automatically;
• The greater the power of the device, the better;
• The charger must have a built-in indicator and display;

The cheapest devices are not recommended for use, as they have a short service life and can ruin a good battery. More expensive options are of good quality and are more worth the purchase.

Is it possible to charge the crown at 9 volts?

All batteries have a limited resource, so even if the battery is not used, sooner or later the chemical reactions inside the product will completely stop.

If the battery is connected to a consumer, then the need to replace it may arise very soon. This article will discuss how to charge a Krona battery at home and whether it is necessary to do so.

Salt and alkaline batteries: differences

• It is important to remember that salt batteries are not charged in a charger. If you do not use the battery for a long time, it will be completely discharged in a couple of years. Salt batteries are very susceptible to temperature changes, they have a small capacity and a short service life. These batteries cannot withstand high loads.
• Alkaline batteries have better performance. They are not sensitive to temperatures, work much longer, have a large capacity and are suitable for recharging in a charger.

According to the rules, only rechargeable batteries can be charged in the charger, but if you maintain an interval of five to ten minutes, you can charge a regular alkaline battery in the same way. It is important to remember not to increase the charging time, as the battery may explode.

Is it possible to charge Krona?

Whether it is allowed to charge the Krona can be found out only after correctly determining the type of battery. In addition to regular salt batteries, there are batteries that are more expensive, but they can be safely connected to a charger many times.

Which are the battery

You can determine whether the Krona is a rechargeable battery type by the markings. With the possibility of repeated restoration, the following products are used:

• Nickel-cadmium - average capacity 120 mAh, designation: Ni-Cd.
• Nickel metal hydride - capacity 250 mAh, designation: Ni-Mh.
• Lithium-ion – up to 700 mAh; Li-Ion.
• Lithium iron phosphate – up to 320 mAh; LiFePO4

The listed types of rechargeable batteries can be successfully used in any equipment where the Krona battery can quickly discharge.

The use of rechargeable batteries makes it possible to maintain the functionality of electronic devices in the most efficient way, in terms of financial costs.

which are not battery

In addition to conventional salt batteries, the category of “non-accumulators” of size 6f22 (Krona) includes the following products:

• Alkaline.
• Lithium iron sulfide.
• Manganese-lithium.
• Air-zinc.
• Lithium theonyl chloride.

All batteries listed are "disposable". When connecting DC products to the contacts of such products, the product may become very hot and the shell may rupture, so it is not recommended to take risks and try to restore a dead battery.

How to charge at home

All Krona batteries that support recharging can be restored at home.

Rechargeable

To restore the battery, it is better to purchase a special charger. Such devices are inexpensive, but, unlike home-made products, they allow you to control the level of element recovery and timely turn off the supply of electricity to the contacts when necessary.

In order to activate the charge restoration process, simply install the battery in a special slot and plug the device into the network. If you need to charge several cells of this size at once, it is better to purchase a more expensive charger with the ability to simultaneously install 2 or more batteries.

Regular

It is unsafe to infect ordinary Crohn's, but if there is a need to restore the product in the field, then a mechanical method can be used.

For this purpose, it is enough to carefully flatten the product. This procedure should be carried out very carefully so as not to destroy the internal elements of the battery or break the electrical contact.

Heating a non-rechargeable battery in the oven will also slightly restore a dead 6LR61 battery. The maximum temperature should not exceed 100˚C, and the thermal effect should not last more than 15 minutes. After this procedure, before using the battery, you must wait for it to cool completely.

The supply of electric current can also slightly revive a discharged Krona battery, but restoring the battery in this way should be done while constantly monitoring the temperature of the product body. If you overexpose the battery to such a charge, then an explosion may occur due to boiling of the electrolyte.

Popular manufacturers and their features

The Krona battery can be produced by many companies, but most often this battery can be found on store shelves under the following brands:

1. Energizer - under this brand the Krona battery was first released and over more than half a century of history, the quality of the battery has only improved. Thanks to the use of alkaline electrolyte, the battery will last several times longer than conventional salt batteries of this type.
2. Panasonic - “Krona” from a well-known manufacturer of electrical appliances is distinguished by its increased quality, which is manifested, first of all, in an increase in service life. Particularly “long-lived” are alkaline batteries, which will last 3 to 5 times longer than conventional salt batteries.
3. Camelion - the battery of this company is characterized by stable operation for a long time. Ideal for devices where replacing the battery requires significant disassembly of the device case.
4. Daewoo - a source of constant 9 volt electricity from this manufacturer also has good resistance to significant load.
5. Varta - a battery from a well-known battery manufacturer has an increased service life.
6. Samsung pleomax - a battery from this company is ideal for devices in which the electrical current consumption is not too high.
7. Trophy - the products of this company also meet all the necessary requirements, therefore they can be successfully used to replace 6F22 installed in almost any electrical devices operating at a voltage of 9 volts.
8. Cosmos - “Krona” from a well-known domestic manufacturer of electrical equipment is not inferior in quality to the best imported samples.
9. GP – if you need to purchase a “Krona” from this manufacturer, then the best option would be the gp supercell 1604s model, which has one of the best power ratings among similar products.

Precautionary measures

Even reliable devices can sometimes fail or operate incorrectly, therefore, if it is necessary to recharge the Krona battery, it should not be left in the charger slot unattended for a long time.

Lithium batteries can catch fire when attempting to recharge or when the case is accidentally or intentionally depressurized. For this reason, batteries of this type should be handled with the utmost care.

There is no need to invent chargers for rechargeable batteries yourself. There are a sufficient number of working diagrams on the Internet that can be used to make chargers at home.

When using such charges, you should also try not to leave the device turned on unattended, and also observe the polarity, that is, connect the plus to the positive contact, and the minus to the negative.

Rules of operation and disposal

When using a battery, certain rules must be followed. Despite the fact that the contacts are made for special terminals, polarity violation is also possible when trying to connect contact wires. Such actions can end disastrously for a miniature electronic device.

Do not short-circuit the battery contacts, otherwise the product will become very hot and explode. If you need to solder wires directly to the battery terminals, then it is better to use contact welding to perform this work, otherwise, due to exceeding the maximum permissible temperature, the product may also fail.

If the Krona 6F22 no longer shows signs of life, then it must be removed from the battery compartment and disposed of. Do not throw the battery in the trash. You can return a dead battery to electronics supermarkets and specialized collection points.

It's worth exercising

If you use Krona batteries, you will have to recharge them every time the battery runs out of electricity.

It is unsafe to restore conventional batteries; moreover, such actions can lead not only to the destruction of the old battery, which is completely unsuitable for subsequent use, but also to the new charger, the cost of which can be significant.

In some cases, the operation of restoring salt or alkaline Krona can be resorted to when there is no new battery, but it is urgent to turn on some device that runs only on a battery of this type.

Still have questions or have something to add? Then write to us about it in the comments, this will make the material more useful, complete and accurate.

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How long will it take?

We personally tried this life hack for charging your phone at hand. For example, it took us only 7 minutes to increase the charge of the iPhone SE smartphone from 60% to 67%. The exact charging time you'll need to revive your dead phone will depend on how low your device is and how much charge is left in the battery.

Of course, in order to somehow recharge a dead phone, you will have to hold the battery and charger in your hands in an awkward position. Your arms may get tired. But you can find a way. For example, secure the “Crown” to the charger with tape or place the structure on the table and press it with heavy books.

How to properly charge a Krona battery

• How to charge the crown
• How to draw an oak tree
• Type D batteries: description, characteristics

The LM317T chip is a voltage stabilizer. To use it for other purposes - as a current stabilizer - connect a load resistor between its output and the control output. Calculate its resistance using Ohm's law, taking into account that the voltage at the output of the stabilizer is 1.25 V. To do this, substitute the charging current, expressed in milliamps, into the following formula: R = 1.25/I The resistance is in kilo-ohms. For example, for a charging current of 12.5 mA the calculation will look like this: I=12.5 mA=0.0125A

Characteristics of Krona batteries

The batteries are of types AA, AAA, C, D, they are cylindrical in shape and differ only in size. In contrast, the Krona battery has a standard size of PP3 and is a parallelepiped. Salt batteries are characterized by their fragility and cannot be used in high-tech devices. The maximum they are designed for is a quartz watch or other simple device. Batteries are also distinguished by their electrochemical system. Alkaline and lithium batteries have better performance.

Krona mini-batteries are distinguished by fairly high performance; they have an output voltage of around nine volts (in comparison, a lithium or alkaline AA battery “produces” only 1.5 volts). The Krona battery consists of six one-and-a-half-volt batteries connected in series in one chain (the output is nine volts.) The batteries can have a current of up to 1200 mAh, the standard power is 625 mAh. The capacity of Krona batteries will vary depending on the types of chemical elements. Nickel-cadmium cells have a capacity of 50 mAh, nickel-metal hydride batteries are an order of magnitude more powerful (175-300 mAh). Lithium-ion cells have the highest capacity, their power is 350-700 mAh. The standard size of Krona batteries is 48.5x26.5x17.5 mm. These batteries are used in children's toys and control panels; they can be found in navigators and shockers.

Operating principle of the charger

The voltage at the non-inverting input of the microcircuit is greater than the voltage at the inverting input. The output voltage of the operational amplifier is close to the supply voltage, transistor VT1 is open and a current of about 10 mA flows through the LED. When charging the battery, the voltage across it increases, which means the voltage at the inverting input also increases. As soon as it exceeds the voltage at the non-inverting input, the comparator will switch to another state, all transistors will close, the LED will go out and the battery will stop charging. The maximum voltage at which battery charging stops is set by resistor R2. To avoid unstable operation of the comparator in the dead zone, you can install a resistor, shown in the dashed line, with a resistance of 100 kOhm.

This circuit is well suited not only for conventional battery “ Krona”

“, but also other types of batteries. You just need to select the resistance of resistor R7 and, if necessary, install a more powerful transistor VT3.

The finished memory can be placed in any plastic box of suitable size. Cases for non-working mobile phone chargers are also perfect. For example, one working, converted to a higher voltage, charging is a 15V voltage source, and the other will contain elements of the circuit of the charger itself and contacts for connecting the “ Crown”

". Assembly and testing of the device: sterc

Discuss the article CHARGING THE 9V BATTERY CROWN

How to charge the crown

Dead batteries are restored by an asymmetrical pulsating current. If you know how to work with a soldering iron and read circuit diagrams, assemble such a console yourself. The schematic diagram is shown in the figure on the left. Take any transformer with a voltage on the secondary winding of 6.3-9 volts. Zener diode VD1 serves to limit battery charge. The rectifier of the set-top box is assembled on diodes VD2, VD3 and capacitor C1. Resistor R1 and button SB1 are used to control battery charging. The degree of battery charge is judged by the change in the glow of the HL1 lamp. Before charging it burns at half incandescence, after charging it glows brightly. The lamp is used at 6.3 volts. Solder the attachment on a small circuit board or surface-mounted. The plus of the battery is connected to the plus of the circuit, the minus to the minus. Charging time from 3 to 5 hours.

If you have a dead car battery, charge the battery from it. Connect the plus of the battery to the plus of the battery, the minus to the minus. Charging time depends on the heating of the battery. Ideal - 5 hours.

Charge the Krona using an unnecessary cell phone charger. Its output voltage should be 9 volts, and the current strength should be at least 500 milliamps. Cut off the plug from the charger connecting to the phone. Strip its wires. Connect the red wire (plus) to the battery positive, the blue wire (minus) to the negative. Plug in the charger. Battery charging time is 5 hours.

Charge the battery from the power supply. It must be 9 volts, with an output current of at least 500 milliamps. An unnecessary power supply, for example, from a broken Dandy game console, will do. Cut off the plug and strip the wires. Use a multimeter to determine the polarity of the output voltage. Connect the plus of the power supply to the plus of the battery, and the minus to the minus. Plug in the power supply. Battery charging time is 5 hours.

Purchase a special device for charging batteries. This is the best way. The photo on the left shows one of these consoles, “Battery Wizard”. The good thing about the set-top box is that all regeneration modes for batteries connected to it are carried out automatically.

Follow safety precautions. If the battery says “do not recharge”, do not charge it under any circumstances. This can cause the electrolyte inside the battery to boil, causing it to swell and explode. The hot electrolyte will scatter in all directions, which can lead to serious burns if it comes into contact with the skin. When charging the battery in any way, constantly monitor the temperature of its case. It should be slightly warm. If the case becomes hot, stop charging the battery immediately. Don't charge it again, buy a new one.

Domestic industry has ceased production

Among the many schemes for assembling chargers for Krona batteries, I found one that was relatively simple and affordable. By the way, the 9-volt battery, known in Russia and the CIS countries as “Krona,” has a 6F22 standard.

The battery consists of 7 4A nickel-metal hydride batteries connected in series. The recommended charging current is no more than 20-30 mA.

The charger is manufactured by redesigning a Chinese-made mobile phone charger.

There are 2 types of inexpensive chargers originating from China. They are pulsed, and both are based on self-oscillator circuits capable of delivering 5 V output.

The first type is the most common. It does not have control of the output voltage, but by selecting a zener diode, which is located in such circuits in the input circuit near the 1N4148 diode, you can obtain the desired voltage. Usually there are two types - 4.7 and 5.1 V.

To charge the Krona you need a voltage of about 10-11 V. This can be achieved by replacing the zener diode with one that has the appropriate voltage. It is also recommended to change the capacitor, which is located at the charging output. As a rule, it is 10 V. You need to install a 16-25 V capacitor with a capacity of 47-220 μF.

The second type of such circuits has control of the output voltage, implemented by installing an optocoupler and a zener diode.

Take a look at the principle of redesigning the second circuit.

It is necessary to remove all components located after the transformer, and leave only the unit that controls the output voltage. This unit consists of an optocoupler, a pair of resistors and a zener diode.

It is necessary to replace the diode rectifier, since manufacturers claim a charging current of 500 mA, and the maximum diode current is no more than 200 mA, although the peak current is about 450 mA. It's dangerous! In general, you need to install the FR107 diode. Thus, charging will produce the required voltage.

The next thing to do is to assemble a current stabilization unit, using the LM317 microcircuit as a basis. In general, you can get by with one quenching resistor instead of assembling a stabilization unit.

But in this example, preference is given to reliable stabilization, because the Krona battery is not the cheapest.

Resistor R1 affects the stabilization current. The calculation program can be downloaded in the Attached files at the end of the article.

The operating principle of this circuit is as follows:

When the Krona is connected, the LED lights up.

A voltage drop is created across resistor R2. Gradually, the current in the circuit decreases, and the voltage that allows the LED to light suddenly becomes insufficient. It simply goes out.

This occurs at the end of the charging process, when the battery voltage becomes equal to the charger voltage. The charging process stops and the current drops to almost zero.

All that remains is to attach the battery connector to the case, which can be made from a non-working battery.

Solder the plug to the shielded audio cable Universal protection for batteries

If your phone's battery has died and you don't have a charging outlet at hand, you can revive your gadget using a regular 9-volt Krona battery.

Next, line up the 9-volt Krona battery and connect the large (negative) terminal to the spring. The positive contact of the battery should touch the center of the car charger.

How to charge a Krona battery

In the Soviet Union, carbon-manganese batteries of this size were produced, as well as alkaline ones, which had a higher price and were called “Korundum”. The batteries were produced from rectangular biscuits; for their manufacture, a metal body made of tinned tin, a bottom made of plastic or genitax, and a contact pad were used. Simple disposable Krona batteries allowed a small number of recharges, although this was not recommended by the manufacturer. However, due to the shortage of these batteries, many books and magazines published diagrams of chargers for Kron.

The life of a disposable Krona battery can be extended by using a unit with current and voltage regulation. First you need to determine the charging current of the battery; to do this, its capacity must be divided by ten (for example, 150 mAh: 10 = 15 mAh - for this charger the voltage should not be more than 15 volts). You can charge the Krona no more than twice. It should be borne in mind that if the elements inside it are dry, it will not be possible to charge it again.

It is not safe to charge an ordinary Krona, Corundum or similar battery. But rechargeable batteries are also produced in the same form factor. These include, say, 7D-0.125, “Nika” and countless imported analogues.

Instructions

1. Familiarize yourself with the pinout of the Krona battery. The battery itself or a battery of this type, as well as the power supply that replaces it, has a large terminal - negative, and a small terminal - positive. For the charger, as well as for any device powered by the Krona, everything is the opposite: the small terminal is negative, the large terminal is positive.

2. Make sure that the battery you have is a genuine rechargeable one.

3. Determine the charging current of the battery. To do this, divide its capacity, expressed in milliamp-hours, by 10. You get the charging current in milliamps. Let's say for a battery with a capacity of 125 mAh, the charging current is 12.5 mA.

4. As a power source for the charger, use any power supply whose output voltage is about 15 V, and the maximum possible current consumption does not exceed the charging current of the battery.

5. Check out the pinout of the LM317T stabilizer. If you put it with the front side with the marking towards you, and the totals down, then on the left there will be an adjustment total, in the middle there will be an output, on the right there will be an input. Install the microcircuit on the heat sink, the one that is isolated from any other current-carrying parts of the charger, since it is electrically connected to the output of the stabilizer.

6. The LM317T chip is a voltage stabilizer. In order to use it for other purposes - as a current stabilizer - connect a load resistor between its output and the control output. Calculate its resistance using Ohm's law, considering that the voltage at the output of the stabilizer is 1.25 V. To do this, substitute the charging current, expressed in milliamps, into the following formula: R = 1.25/IThe resistance is in kilo-ohms. Let's say, for a charging current of 12.5 mA, the calculation will look like this: I = 12.5 mA = 0.0125AR = 1.25/0.0125 = 100 Ohm

7. Calculate the power of the resistor in watts by multiplying the voltage drop across it, equal to 1.25 V, by the charging current, also previously converted to amperes. Round the total up to the nearest standard value.

8. Connect the plus of the power source to the plus of the battery, the minus of the battery to the input of the stabilizer, the adjusting result of the stabilizer to the minus of the power source. Between the input and the adjusting result of the stabilizer, turn on an electrolytic capacitor of 100 μF, 25 V plus to the input. Shunt it with a ceramic container.

9. Turn on the power supply and leave the battery to charge for 15 hours.

All batteries are divided into two types. Primary - used once, and after that they become unusable. Secondary ones are charged and used again. There are four types of rechargeable (secondary) batteries depending on the chemical reagent included in the composition: 1) nickel-metal hydride - “NiMH”; 2) nickel-cadmium - “NiCd”; 3) lithium-ion – “Li Ion”; 4) sealed lead-acid - “SLA”. To charge your batteries, follow simple rules.

You will need

Instructions

1. Buy a charger of this type, one that will fit your rechargeable batteries. Let's say, if you have NiMH AA batteries with a milliampere charge (mAh) of 2650, i.e. strong enough, you will need a NiMH battery charger with a high charging rate. Otherwise, the batteries will take too long to charge.

DIY charger for Krona

In general, there are a lot of circuits for such chargers.
This article presents a simple and affordable option that will help you make a charger for Krona while saving money and effort. The proposed circuit based on charging for a mobile phone allows you to make a device with your own hands. The author of the video is blogger Aka Kasyan. By the way, a 9-volt battery is called Krona only in Russia and other countries that came from the USSR. In the world it is known as standard 6 f 22. Krona owes its name to a simple battery of the same standard, which was produced in the USSR.

Everything you need to assemble the device can be found in this Chinese store. Please note products with free shipping.

The battery crown is an assembly of series-connected batteries, a rather rare 4a standard. In general, there are 7 of them. Typically this is a nickel metal hydride type.

Charging schemes for battery Krona

It is recommended to charge the battery crown with a current of no more than 20 - 30 milliamps. It is recommended not to increase the current above 40 milliamps under any circumstances. The charger circuit is relatively simple and is based on a Chinese mobile phone charger. Cheap Chinese chargers come in two main types. Both, as a rule, are pulsed and implemented using self-oscillator circuits. The output provides a voltage of about 5 volts.

First type of charger

The first variety is the most popular. There is no control of the output voltage, but it can be changed by selecting a zener diode, which, as a rule, in such circuits are located in the input circuit. The zener diode is most often 4.7 - 5.1 volts. To charge the crown we need to have a voltage of about 10 volts. Therefore, we replace the zener diode with another one with the required voltage. It is also recommended to replace the electrolytic capacitor at the charger output. We replace it with 16 - 25 volts. Capacity from 47 to 220 microfarads.

Second type of charging

The second type - the circuit for charging mobile phones is a self-oscillator circuit, but with control of the output voltage through an optocoupler and a zener diode. In such circuits, either a regular zener diode or an adjustable one, like tl431, can be used as a controlling element. In this case, the most common zener diode is 4.7 volts.

The video shows a modification method based on circuit 2. First we remove everything that is after the transformer, except for the output voltage control unit. This is an optocoupler, a zener diode and two resistors. We also replace the diode rectifier. We replace the existing diode with fr107 (an excellent budget option).

We also replace the output electrolyte with high voltage. We select a 10 volt zener diode. As a result, charging began to output the voltage required for our purposes.

After remaking the charger, we assemble a current stabilization unit based on the lm317 microcircuit.

In principle, for such insignificant currents you can do without a microcircuit. Instead, install one quenching resistor, but preferably good stabilization. Still, the battery crown is not a cheap type of battery. The stabilization current will depend on the resistance of resistor r1; the calculation program for this microcircuit can be found on the Internet.

This scheme works very simply. The LED will light up when the output is loaded. In this case, Krona, since there is a voltage drop across resistor r2. As the battery charges, the current in the circuit will drop and at one point the voltage drop across each resistor will be insufficient. The LED will simply go out. This will be at the end of the charging process, when the voltage on the Krona is equal to the voltage at the output of the charger. Consequently, further charging process will become impossible. In other words, an almost automatic principle.

You don’t have to worry about Krona, since the current at the end of the charging process is almost zero. There is no point in installing the lm317t microcircuit on a radiator due to the scanty charging current. It won't heat up at all.

In the end, all that remains is to attach a connector for the Crown to the output of the charger, which can be made from the second non-working Crown. And, of course, think about the housing for the device.

Charging for Krona from a dc-dc converter

If you take a small dc-dc converter board, then you can easily make USB charging for the crown. The converter module will increase the voltage of the USB port to the required 10-11 volts. And then along the circuit there is a current stabilizer on lm317 and that’s it.

Source

Characteristics of Krona batteries

The batteries are of types AA, AAA, C, D, they are cylindrical in shape and differ only in size. Unlike them, the Krona battery has a standard size of PP3 and is a parallelepiped. Salt batteries are characterized by their fragility and cannot be used in high-tech devices. The maximum they are designed for is a quartz watch or other simple device. Batteries are also distinguished by their electrochemical system. Alkaline and lithium batteries have great performance. Krona mini-batteries are quite highly efficient; they have an output voltage of around nine volts (in comparison, a lithium or alkaline AA battery “produces” every 1.5 volts). The Krona battery consists of six one-and-a-half-volt batteries combined stepwise into one chain (the output is nine volts.) The batteries can have a current of up to 1200 mAh, the standard power is 625 mAh. The capacity of Krona batteries will vary depending on the types of chemical elements. Nickel-cadmium cells have a capacity of 50 mAh, nickel-metal hydride batteries are an order of magnitude more powerful (175-300 mAh). Lithium-ion cells have the largest capacity; their power is 350-700 mAh. The typical size of Krona batteries is 48.5x26.5x17.5 mm. These batteries are used in children's toys and control panels; they can be found in navigators and shockers.

Application area

The Krona 6F22 battery is used in devices that require an increased voltage value, namely 9 Volts. When you open the case of the following devices, you can find this type of battery inside:

• Children's toys.
• Measuring instruments.
• Remote controls.
• Radioelectronics.
• Medical devices.
• Alarm systems.
• Flashlights.

The battery is highly resistant to adverse operating conditions, so it can be used, among other things, in military devices, such as dosimeters and communication devices.

How to charge a Krona battery

In the Soviet Union, carbon-manganese batteries of this size were produced, as well as alkaline ones, which had a higher price and were called “Corundum”. The batteries were produced from rectangular biscuits; a metal body made of tinned tin, a bottom made of plastic or genitax, and a contact pad were used for their manufacture. Primitive disposable Krona batteries allowed a small number of recharges, although this was not recommended by the manufacturer. However, due to the shortage of these batteries, many books and magazines published diagrams of chargers for Kron. The operation of a disposable Kron battery can be extended by using a unit with regulation of current and voltage. First, you need to determine the charging current of the battery; to do this, its capacity must be divided by ten (say, 150 mAh: 10 = 15 mAh - for a given charger, the voltage should not be more than 15 volts). The Krona can be charged no more than 2 times. However, it should be considered that if the elements inside it are dry, it will not be possible to recharge it.

Every ornamental plant needs careful care and education. This applies exclusively to the crown. In nature, it is rare for a plant to naturally acquire its perfect form, but under unnatural conditions this is virtually unthinkable. Consequently, gardeners have to form the crown themselves, fortunately it is not as difficult as it seems.

Instructions

1. For such ornamental plants as dracaena, ficus, money tree (crassula), lemon, regular pruning and pinching are easily needed. Otherwise, the plant may begin to grow, stretching upward immensely, and producing side, “extra” shoots. At the same time, its branches lose their shape and acquire ragged outlines.

2. In order to positively form the crown , you need to consider the physiology of the plant and the characteristics of its growth. Its plant tends to stretch upward, producing thin and weak shoots; pinching will help. However, there are some subtleties that you need to know. In order to pinch the plant correctly, you need to wait until three or four pairs of young leaves appear on the branch, and a new bud appears between the last pair. It will need to be carefully removed (pinched). It’s cooler to do this with tweezers or nails. You need to be careful not to damage the leaves themselves. After positive pinching, new buds will appear on the branch - two or three pieces. And as a result, the plant will begin to branch.