# Advice 1: How to know the battery capacity

The capacity of the battery is the amount of energy in it (of charge Q, of electricity). Measured capacity of the battery or batteries in milliamperes per hour or amps per hour. So, for example, a battery having a capacity of 1000 milliamps/hour, can provide a current of 1000 milliamps for one hour or a current of 100 milliamps for 10 hours, etc. Knowing the voltage U can be easily calculated stored in the battery energy is sufficient to know the formula: E = Q*U.
You will need
• charger., stopwatch.
Instruction
1
Buy, hire or borrow a special device to measure capacitance of the battery. Take the battery and fully charge it, then discharge it using the current (I). Measure the time (T) during which it will discharge.
2
Calculate the product of current, which will be the capacity of the battery. To do this, take the amperage and time, and multiply (Q = I*T). I note that in the same way you can measure the capacity of any battery, and regular batteries. But it should be remembered that the simple battery charge again, unlike a battery, it will be impossible.
3
In order to know the capacity of the battery, you can use other methods. So to measure the capacity of the specified device, you can use a special scheme that allows you to discharge the battery through the resistor (R). Moreover, such a discharge is performed to a voltage of approximately 1W. Then measure the discharge current according to the formula: I = U/R.
4
To measure the discharge time, you can use an ordinary watch, capable of working at 1.5 watts. When you discharge the battery, remember that the device should not be discharged completely, and for this it is necessary to use special solid relay, for example, PVN012. This relay allows time to disconnect the battery at the moment when the voltage drops to a minimum level. Allowed the reduction to 1W, as already noted.
5
Connect the discharged battery to the circuit. Enable the profile and set the stopwatch include clock. When the discharge reaches 1 W, the relay will close and clock will stop.
6
To see how much charge it loses battery after about a week or two of use, when discharge, it is necessary to measure the capacity of the device after it is fully charged and make such measurements after another week or two.

# Advice 2: How to determine the battery capacity

Capacity is one of the main indicators of quality batteries, which shows the amount of energy contained in them. In the process of operation, this energy decreases. To determine how much will last the battery in several ways.
Instruction
1
To determine the capacity of the battery you need to purchase a special device or ask it from their friends. Then proceed as follows. Fully charge the battery, and then using the current, use it. Note the time during which it will discharge the battery.
2
Perform a calculation that will allow you to learn the battery capacity. The strength of the current used to discharge the battery, multiply the time spent on her complete devastation. The product of these two quantities is the amount of energy that can contain a battery. Keep in mind, likewise you can determine the capacity of any battery, including car battery and an ordinary battery.
3
Use another way to know the battery capacity. But note, for this you need a special scheme through which it is possible to discharge the battery through the resistor when the voltage magnitude not exceeding 1 volt. Next, calculate the amperage by the formula:
I = U/R. For registration of the discharge time, use a regular stopwatch or clock.
4
Be careful using this method. Make sure the battery is not fully depleted. To avoid this, use solid state relays, which can be used to disconnect the battery at precisely the moment when the voltage drops to the minimum mark.
5
One of the easiest ways to determine the capacity of a battery is the device information is specified on the tag manufacturer. Grab your battery and carefully inspect its surface, which should be displayed all the necessary information for operation of the device. If there is no sticker or it is jammed, follow the operations described above.
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