The battery voltage is 3.7V and the capacity is 1000mAh, which means that after being fully charged, the stored energy is: 3.7V × 1A × 3600 s = 13,320 joules. 1 kilowatt hour of electricity = 3,600,000 joules.
3,600,000 joules ÷ 13,320 joules = 270 times. This is how the calculation is done. You can check the specific voltage of the battery yourself, and this is when the internal resistance of the battery is ignored and the energy loss is not taken into account.
Battery capacity refers to the amount of energy stored in the battery. The unit of battery capacity is "mAh", and the Chinese name is milliampere-hour (when measuring large capacity batteries such as lead-acid batteries, for convenience, it is usually expressed as "Ah ", the Chinese name is ampere-hour, 1Ah=1000mAh). If the nominal capacity of the battery is 1300 mAh, that is, a currentof 130mA discharges the battery, the battery can continue to work for 10 hours (1300mAh/130mA = 10h) if the discharge current is 1300mA, the power supply time is only; about 1 hour (actual working time. There are some differences due to individual differences in actual battery capacity). This is an analysis under ideal conditions. The actual current of a digital device cannot always be constant at a certain value (taking a digital camera as an example, the operating current will vary greatly due to the opening or closing of components such as screens LCD). and flashlights).
Capacity unit
Usually we talk about battery capacity in ampere-hours, which is based on a certain battery that has been determined.
For example, what is the battery capacity of this cell phone? What is the capacity of the baWhat about this battery car? They are all intended for different batteries. The battery voltage was determined without taking into account the actual voltage. Just say amp hours to represent battery capacity.
However, for batteries of different voltages, we cannot simply use amp hours to represent capacity. For example, a 12V 20AH battery and a 15V 20AH battery, even though they are both 20AH, provide the same power. load, the equipment It can work normally, but the duration is different, so the standard capacity should be in work units.