If the battery in your phone has ordered to live for a long time, and there is no outlet for charging at hand, you can reanimate your gadget using a regular 9-volt Krona battery.
You may have already seen this hack on the Internet. ... This time we offer you another, easier way to charge your phone battery with a cheap battery.
To do this, you need one that you plug into your cigarette lighter. Next, take the spring from the automatic ballpoint pen and put it on the metal corner on the side of the charger, as shown in the photo above.
Then line up the 9V Krona battery and connect it with the large (negative) terminal to the spring. The positive contact of the battery should touch the center of the car charger.
How long will it take?
We personally tried this life hack for handy phone charging. For example, it took us only 7 minutes to increase the charge of the iPhone SE from 60% to 67%. The exact charging time you need to reanimate your fully discharged phone will depend on how badly your gadget has run down 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 uncomfortable position. Your hands may get tired. But you can find a way out. For example, fix the "Krona" on the charger with adhesive tape or put the structure on the table and press down with heavy books.
How many batteries do you need to fully charge your phone?
A typical 9-volt Krona battery has charge capacity 500 milliampere hours (mAh)... Compare it to your phone's battery capacity. Here are some examples:
- iPhone 8: 1,821mAh
- iPhone 7: 1,960mAh
- iPhone SE: 1,624mAh (this is the phone we tested)
- Galaxy S8 or S9: 3000mAh
- Pixel 2: 2,700mAh
To fully charge your phone with a 3000mAh battery, you need about 6 batteries. Thus, this life hack is not ideal if you want to charge your phone to a full battery.
In this case, you will not only have to throw out a lot of batteries after charging, but also spend a huge amount of time charging. But nevertheless, this is a great life hack for those who do not know how to charge their phone without electricity, at least in order to write a few messages or make several calls, informing about themselves.
At least one Krona battery will be enough for you to turn on and you can ask for help by calling 112.
This is one of the best life hacks for motorists who can find themselves in a deserted place with a dead phone and a fully depleted car battery, which will not allow the phone to be reanimated to call and ask for help. So we recommend a few Krona 9-volt batteries.
What if this method doesn't work?
First, make sure everything is connected. The spring should touch the metal of the side cover of the car charger. You may need to press a button on the end of the car charger (positive terminal) and your charging cable should be connected as usual.
On larger phones, in theory, this kind of battery charging could potentially have problems supplying sufficient voltage under load. As a result, the phone charging can be started and turned off many times. To do this, then you need to add two 9-volt AA batteries (finger-type batteries), as in the photo:
To connect the crown and finger batteries, you can use ordinary foil as a contact. By the way, it is more convenient to glue it to the battery using super glue.
Attention! Make sure the pieces of foil do not touch each other, if you do not want to short circuit!
Also, if you buy batteries and put them in the glove compartment of your car, do not forget to throw in it the automatic ballpoint pen with a spring inside, which you will need to connect the car charger to the battery. As a last resort, you can of course use pieces of aluminum foil instead of the spring. But the spring from a ballpoint pen is easier and more convenient to use.
But better and more modern is to get a portable charger, which you should take with you, having previously charged it at home from the outlet. In this case, you will never have a headache on the road, where to charge the phone if the battery is dead in the car.
Also, do not forget that if you took your laptop with you, then you can charge your phone using the computer by plugging the phone charging cable into the laptop's USB port.
Among the many schemes for assembling chargers for batteries of the "Krona" type, there was also a relatively simple and affordable one. By the way, the 9-volt battery, known in Russia and the CIS countries as "Krona", has the 6F22 standard.
The battery consists of 7 4A NiMH batteries in series. The recommended charging current is no more than 20-30 mA.
The charger is made by reworking a Chinese-made mobile phone charger.
There are 2 types of inexpensive chargers from China. They are pulsed, and both are based on self-oscillating circuits capable of delivering 5 V at the output.
The first type is the most common. There is no output voltage control in it, but by picking up a zener diode in such circuits in the input circuit near the 1N4148 diode, you can get the desired voltage. Usually it is of 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 located at the charging output. As a rule, it is 10 V. You need to put a 16-25 V capacitor with a capacity of 47-220 uF.
The second type of such circuits has output voltage control, implemented by installing an optocoupler and a zener diode.
Take a look at the principle of reworking the second circuit.
It is necessary to remove all the components after the transformer and leave only the unit that monitors the output voltage. This assembly consists of an optocoupler, a pair of resistors and a zener diode.
It is necessary to replace the diode rectifier, since the manufacturers declare a charging current of 500 mA, and the maximum diode current is not 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 provide the required voltage.
The next thing to do is to assemble the current stabilization unit, based on the LM317 microcircuit. In general, you can do with one damping resistor instead of assembling the 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 principle of operation of this circuit is as follows:
When the "Krona" is connected, the LED lights up.
A voltage drop is created across the resistor R2. Gradually, the current in the circuit decreases, and the voltage that allows the LED to burn becomes insufficient at one point. It simply goes out.
This happens at the end of the charging process when the voltage across the battery equals the charger voltage. The charging process stops and the current drops to almost zero.
The LM317 microcircuit is not required to be installed on a radiator, unlike, because the charge current is very scanty.
It remains to attach a battery connector to the body, which can be made from a non-working battery.
If you use a DC-DC converter, you get a charger for the "Krona" through the USB port. like this.
Attached files: .
Soldering the plug to a shielded audio cable Universal battery protection
Today the krone battery is used in many electronic devices. This battery is produced by almost all battery companies. On store shelves, there may be a battery of the crown of different manufacturers.
In this article you will find out which companies produce this energy source, how to charge it, what is the cost of the product, what it consists of, and much more!
What is a crown?
The crown is a 9 volt rectangular battery with two poles at one of its ends. This element was created in the Soviet Union, but it is still popular today. May be referred to as PP3.
Is the crown a battery or a rechargeable battery?
This cell was originally produced as a simple battery. But with the development of technology, they began to produce rechargeable batteries of the Krona type. Therefore, there are both battery crowns and conventional ones. At the time of purchase, it is advisable to ask the seller what kind of energy source it is. You can also ask the question: "How many times can you recharge?"
On some of these batteries, everything is already written.
The picture shows that it can be charged as many as 1000 times. But the usual crown is only 2 times. After which it may fail. Manufacturers do not recommend charging it.
Battery krone photo
Below are 6 pictures of 9v power supply.
Well, that's exactly what the crown battery looks like.
Why is the battery called a crown?
It is problematic to answer this question exactly, but it can be assumed that this is due to her appearance. A crown is commonly referred to as a treetop or coin. And from here you can give the answer what the crown battery is called, or rather from where it gets its name.
The two upper poles can be compared to the upper branches of trees. There is a consonant word crown. Perhaps the name of this food element takes from this word. Because it vaguely resembles this subject.
Consider a device for charging low-power 9-volt batteries, type 15F8K. The circuit allows you to charge the battery with a constant current of about 12 mA, and at the end it automatically turns off.
The charger has protection against a short circuit in the load. The device is the simplest current source, additionally includes an indicator of the reference voltage on the LED and an automatic circuit for turning off the current at the end of charging, which is made on a Zener diode VD1, a voltage comparator on an op-amp and a switch on a transistor VT1.
Basic electrical diagram.
The level of the charging current is set by the resistor R7 according to the formula, which you can see in the original article in the picture (click to enlarge).
How the charger works
The voltage at the non-inverting input of the microcircuit is greater than the voltage at the inverting one. The output voltage of the operational amplifier is close to the supply voltage, the transistor VT1 is open and a current of about 10 mA flows through the LED. When the battery is being charged, the voltage on it increases, which means that the voltage at the inverting input also increases. As soon as it exceeds the voltage at the non-inverting input, the comparator switches to another state, all transistors close, the LED turns off and the battery stops charging. The voltage limit at which the battery charging stops is set by the resistor R2. To avoid unstable operation of the comparator in the dead zone, you can install a resistor, shown by a dashed line, with a resistance of 100 kΩ.
This scheme is well suited not only for a conventional battery pack " Crowns", but also other types of batteries. You just need to select the resistance of the resistor R7 and, if necessary, put a more powerful transistor VT3.
The finished charger can be placed in any plastic box of suitable size. Housings from non-working mobile phone chargers are also great. For example, one working, converted to high voltage, charging is a 15V voltage source, and in the other there will be circuit elements of the charger itself and contacts for connection " Crowns". Assembly and testing of the device: sterc
Discuss the article CHARGING THE 9V BATTERY CROWN
The modern world is unthinkable without such necessary devices as a flashlight, radio, remote control. The functionality of these devices is provided by special batteries manufactured by many companies. Among the popular portable power supplies, it is impossible not to note the "Krona", the production of which began in the Soviet Union. Batteries of a similar format, which borrowed their name from their carbon-manganese predecessors, are still being produced.
Specifications
Krona is a collection of six 1.5 Volt batteries connected in series. In total, the chain gives 9 volts. All elements are built into a metal or plastic case, in appearance this device is a parallelepiped.
The most common varieties of such an element are those on which the following markings are present: 6f22, 1604, 6r61, 6lr61, mx1604, er9v, mn 1604, am6, Corundum and others.
It should be noted that connection in wrong polarity is almost impossible. The plus is a plug, and the minus connector is a socket.
The main characteristics of a 9 Volt battery are:
- Height 48.5 mm.
- Width 26.5 mm.
- Depth 17.5 mm.
- Capacity. Up to 700 mAh.
- Voltage - 9 V.
- The weight is approximately 53 grams.
Varieties and their features
Depending on the chemical compound, the following types of Crohn are distinguished. A battery is a galvanic cell in which irreversible electrochemical processes take place. Recharging of products is strictly prohibited, as such actions may cause depressurization and leakage of harmful substances. Let's figure out what kind of Kron batteries are.
Manganese-zinc salt. Such batteries were mass-produced by American firms at the end of the nineteenth century. They served as a power source for radios, automotive equipment, equipment for the mining industry, aviation and the navy. They were replaced by salt ones: an ammonium chloride solution was used as an electrolyte, and the electrodes were made of manganese and zinc oxide.
Now the scale of production of such elements is decreasing. The main disadvantage of batteries is the formation of a white coating in the battery compartments, which leads to a rapid failure of equipment. In addition, grains of salt deposited as a result of depressurization can harm human health.
Alkaline. They represent the next generation of batteries, also called alkaline batteries. They differ from previous products in higher cost and longer service life. The operation of these elements is possible even with intense loads.
Lithium iron disulfide. They have a solid positive electrode made of what we know as pyrite. The performance of such batteries is maintained at temperatures up to minus forty degrees. Interest in them is growing from year to year.
Manganese-lithium. The electrode in such instances is made of manganese dioxide. As a result of a chemical reaction, lithium oxide is formed.
Zinc air. The principle of operation is based on the reaction that occurs during the oxidation of zinc with atmospheric oxygen. A promising, environmentally friendly version of products, moreover, has a large capacity.
Lithium thionyl chloride. They do not lose their performance properties at extremely low and high temperatures. Thanks to these characteristics, they are used in outdoor meters, surveillance systems, and electronic devices for military and aerospace purposes.
Krona batteries
The main difference between rechargeable batteries and conventional batteries is the ability to recharge them. That is, they can be charged and discharged for a limited number of cycles. The Krone battery is charged using a special charger for this standard size, connected to the mains.
Ni-Cd. Nickel cadmium batteries have a capacity of 120 mAh. Withstands over 1000 recharge cycles. Due to the affordable price, they are widely used.
Ni-MH. The capacity of nickel metal hydride cells is in the range of 170-300 mah. They are safe for disposal, do not contain impurities of heavy metals.
Li-ION. Effective products that stand out for their performance. The capacity of lithium rechargeable cells ranges from 350 to 700 mph. The most promising of the above, however, work efficiently only at positive temperatures, at negative temperatures they begin to dramatically lose capacity.
Li-Po. The newest invention that can be found on store shelves today. The principle of operation is based on pulse conversion. The case has a built-in battery that can be recharged from any 5 Volt source, for example, from the USB port. Does not adversely affect the operation of sensitive equipment: radio microphones, receivers.
Where is the Krone battery used
The scope of Cron is very extensive. They are suitable for devices operating at a voltage of 9 V, these are: 
- control panels;
- radio receivers;
- radio-controlled children's toys;
- multimeters;
- stun guns;
- dosimeters;
- gPS navigators;
- autonomous fire detectors;
- some medical devices.
In general, the battery is used in those areas where its benefits are invaluable. The pluses include:
- excellent performance;
- reliability and efficiency;
- light weight, compact size;
- a charge that persists over a long period;
- environmental friendliness.
How to charge the Krone battery
Chargers available on the electrical goods market are designed to charge the battery Crown. Such devices differ in their capabilities and power indicators. However, you can make them yourself: craftsmen make such devices from cheap Chinese chargers for mobile phones. The battery is charged with a current of 10-20 milliamps, the limit is 40 mA. The charging time is calculated using the following formula:
Charge time (in hours) \u003d Coef. multiply by the capacity (in mAh) divided by the value of the charging current. The increasing factor is selected in the range from 1.2 to 1.6 depending on the value of the charging current. The lower the current value relative to the capacitance, the greater the coefficient.
Important! You can only recharge the battery Crown, that is, only when the battery is not a battery. A special designation on the model's case indicates this. It indicates the capacity and the inscription "Rechargeable".
Popular manufacturers and their features
Products known to us under the following brands are especially popular in our country:
- Energizer. Quality pieces produced for over 50 years.
- Duracell. They are highly charged, productive and durable.
- Varta. Has an increased resource of work.
- GP. Some models of this brand have the highest power rating.
- Robiton. Has excellent capacity indicators.
- Camelion. Provides stable operation of the powered device for a long period.
- Space. Produced by a domestic manufacturer, competes with foreign counterparts.
What to look for when choosing
When choosing the right copy, it is important to pay attention to the following product characteristics:
- Rechargeable. The battery provides an opportunity to save money, because to restore performance, it is enough to connect it to the mains via the charger.
- Manufacturer country. Products made in China, even under a well-known brand, are not always of high quality.
- The type of electrolyte used. The durability of the battery depends on this parameter.
When purchasing a product, check the production date. A battery that has been on a store shelf for a year loses about 20 percent of its capacity, so it is better to refuse such an acquisition. Experts advise not to purchase batteries for future use, it is better to buy them if necessary.
Among the many schemes for assembling chargers for batteries of the "Krona" type, there was also a relatively simple and affordable one. By the way, the 9-volt battery, known in Russia and the CIS countries as "Krona", has the 6F22 standard.
The battery consists of 7 4A NiMH batteries in series. The recommended charging current is no more than 20-30 mA.
The charger is made by reworking a Chinese-made mobile phone charger.
There are 2 types of inexpensive chargers from China. They are pulsed, and both are based on self-oscillating circuits capable of delivering 5 V at the output.
The first type is the most common. There is no output voltage control in it, but by picking up a zener diode in such circuits in the input circuit near the 1N4148 diode, you can get the desired voltage. Usually it is of 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 located at the charging output. As a rule, it is 10 V. You need to put a 16-25 V capacitor with a capacity of 47-220 uF.
The second type of such circuits has output voltage control, implemented by installing an optocoupler and a zener diode.
Take a look at the principle of reworking the second circuit.
It is necessary to remove all the components after the transformer and leave only the unit that monitors the output voltage. This assembly consists of an optocoupler, a pair of resistors and a zener diode.
It is necessary to replace the diode rectifier, since the manufacturers declare a charging current of 500 mA, and the maximum diode current is not 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 provide the required voltage.
The next thing to do is to assemble the current stabilization unit, based on the LM317 microcircuit. In general, you can do with one damping resistor instead of assembling the 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 principle of operation of this circuit is as follows:
When the "Krona" is connected, the LED lights up.
A voltage drop is created across the resistor R2. Gradually, the current in the circuit decreases, and the voltage that allows the LED to burn becomes insufficient at one point. It simply goes out.
This happens at the end of the charging process when the voltage across the battery equals the charger voltage. The charging process stops and the current drops to almost zero.
The LM317 microcircuit is not required to be installed on a radiator, unlike a charger for lithium batteries, because the charge current is very scanty.
It remains to attach a battery connector to the body, which can be made from a non-working battery.
battery connector
If you use a DC-DC converter, you get a charger for the "Krona" through the USB port. similar to this charger for Ni-Mh batteries.
DC-DC converter 
Finished device
A huge number of household appliances use finger batteries as a power source. Most of them perform auxiliary functions, so the lack of power in children's toys or control panels brings only temporary inconvenience until new batteries are purchased. But, there are situations when there is nothing to replace a discharged battery, but this must be done right now. At such moments, each of us wondered how to charge the battery at home.
Method number 1. Using the charger
Many of the inhabitants, in addition to ordinary batteries, use accumulators, for which special devices are used to charge. If you have these at home, you can use them to recharge a dead battery.
Figure: 1: using the charger
Please note that for such a recharging from the network, you can only use alkaline or, as they are also called, alkaline batteries, but salt batteries can easily collapse and leak, so you should not even try to charge them.
To charge:
- Install the battery into the charger connector, while observing the polarity;
- Connect the device to the network;
- When sufficient charge has accumulated, disconnect the device from the mains.
Please note that you cannot overexpose the batteries with this method after it signals the completion of the process.
Figure: 2: charge level indicator
If your charger has the same type of alarm as shown in the figure, then after the icon appears on the alarm indicating that the battery is charged, it must be turned off immediately. Otherwise, the battery will inflate or leak, and such destruction can make it impossible to continue to operate and clog the charger. It should also be noted that if you charge in this way, the capacity of the battery will decrease by a third, which is why, after three charges, it will finally fail. Therefore, it will not work to charge it infinitely in this way.
Method number 2. Connection to power supply.
Another option with which you can charge the battery is using the power supply. Such devices are commonly used to charge the same mobile phones, mp3 players, routers and other equipment powered by a voltage of 1.5 to 3 V. To do this, you will need to either connect to the existing pins of the power supply, or cut the connector (if the power supply is no longer used as intended) to obtain “+” and “-” pins.
Figure: 3: Preparing the power supply for charging
To charge the battery:
- Connect the poles to the terminals of the power supply - plus to plus, minus to minus. Be sure to follow the polarity, otherwise instead of charging, you will completely discharge it.
- In this state, it is necessary to charge the battery until it heats up to a temperature of 50 ° C. After that, disconnect it from the power supply.
- Wait for the battery to cool naturally. If this stage is neglected, it can simply burst and become unusable.
- Recharge the battery from the unit, but this time, plug it in for exactly 2 minutes, no more.
- After charging a second time, put the battery in the freezer for 10 minutes.
- Take it out of the freezer and let it warm naturally. After that, you can continue to use the battery for its intended purpose.
Note that this method will help 1-2 times, after which you will need to purchase a new battery. Only alkaline (alkaline) models are also suitable for this method.
Method number 3. Forced heating.
Exposure to high temperatures can help restore working condition. This method is not the easiest and relatively dangerous, because if the battery overheats, it will rupture. The best heating option at home is exposure to hot water.
If the temperature under your tap can be adjusted to a high enough temperature, hold the battery under running hot water. Having previously clasped it with tweezers or pliers, so as not to burn your hands. It is important to ensure that the entire surface area falls under the water.
If you do not have running water or the tap water cannot be heated, boil a small saucepan or mug. You will need enough liquid to completely immerse the battery in it. It should be noted that you do not need to cook it in order to charge it with this method, but only place it in hot water, so after boiling, allow the water to cool for a few minutes before placing the battery in it.
Figure: 4: put the battery in hot water
It should be noted that charging by the method suggested above is allowed no more than 20 seconds. After waiting for this interval, remove the feeding element from the water, let it cool and dry. When it reaches the ambient temperature level, it can be reused.
Method number 4. Reduce volume.
Quite often, you can find a barbaric attitude towards a dead battery - people bite them or hit them on the table. The most incredible thing is that this is a really working way to charge the battery. The only thing worth paying your attention to is the volume reduction method. The main task is to shrink the outer shell to a smaller size.
If you bite the body or hit the asphalt, there is a very high probability of damage to the shell, which will make further operation impossible. The same applies to other methods of applying excessive force, since not every deformation will reduce the volume sufficiently. It is much more profitable to use pliers or a hammer, which evenly press the entire surface of the body in a circle. In some situations, it is possible to charge the battery due to mechanical impact to 80 - 100% of the factory level.
Figure: 5: volume reduction with pliers
This method can be used only once, since with repeated deformation of the shell, it becomes unusable, and the charge is practically not restored.
Method number 5. Boiling.
One way to charge the battery is to boil it in a saline solution. Compared to the previous options, this is a rather laborious method, since you will need to disassemble the battery. For this:
Be sure to perform this procedure very carefully so as not to damage the inner filling, gaskets and other components.
- After removing the shell, re-check the integrity of all internal components (carbon cylinder, rod, zinc cylinder).
- Prepare a solution for boiling - dissolve in tap water 2 tablespoons of ordinary kitchen salt.
- Place the disassembled battery in the still cold liquid and put on fire. Bring to a boil.
- Boil for no more than 10 to 15 minutes, then remove it from the water and let it cool.
- When the battery is easy to handle, replace all the gaskets and outer shell.
Restoring the tightness, it will not be superfluous to glue the shell with glue or close up with plasticine. When sealing, make sure that the adhesive does not cover the contact surface.
Another way is to introduce chemically active reagents into the powder layer. To do this, use a thin sharp object to make at least a couple of holes in the lid so that they pass along the graphite rod.
Figure: 7: hole-making principle
It is better to pre-measure the depth of these holes and mark on the awl so that it does not exceed 3/4 of the total depth of the battery. It is necessary to pour active liquid into the holes made. The same vinegar or 8-10% hydrochloric acid can act as such reagents.
After pouring acid or vinegar into the holes, you need to wait a few minutes for it to be absorbed into the powder. After that, repeat the procedure at least 2 - 3 times, with the same time intervals to absorb the liquid. As a result, you get a charged battery with charge level recovery up to 70 - 80% of the factory value.
It should be noted that to secure the result obtained, seal the holes with the same plasticine, wax or other household sealants. The choice of a specific option should depend on your needs, if you want the battery to last, at least until the morning, you will have enough plasticine. If it needs to last until the end of the hike, use some resin or glue.
From the methods suggested to you that allow you to charge the battery, choose the one that is most suitable for your situation. But, using any of them, remember that it will not work to extend the performance indefinitely, and some models may not charge at all. Therefore, sooner or later you will have to purchase new batteries. And if you like the process of charging the battery, it is better to buy batteries, they are much more efficient with frequent recharging.