How is the power of a battery calculated

How is the power of a battery calculated
A battery that reaches twelve volts but is less than 20ah may not be able to drive.

20ah is the capacity of the battery, not the power. When the current is constant, the larger the capacity, the longer it can be used for power supply.

The meaning of 20ah is that when the battery output current is 20 amps, it can be used for 1 hour, or it can be understood as when the battery output current is 2 amps, it can be used for 10 hours, etc. The product of current and time is 20

When the device requires a high-power battery of 20ah to drive, it indicates that the device has a high operating current, and small capacity batteries may not be able to withstand this high current. If a small capacity battery can withstand the driving current of the device, it can be driven. Just like how you connect more than ten seventh batteries in series to drive an electric bicycle, it cannot be driven.

This is the capacity of the battery, not the power, which means the time it can operate an appliance with a certain power. The length of the operating time depends on the power of the appliance.

In addition to 100Ah, the battery also needs to know the voltage level. This battery can operate for 1 hour at a current of 100 amperes, and the specific power depends on the voltage of the battery. For example, a 12V battery can operate a 1200 watt appliance for one hour with a working current of 100 amperes, and for 10 hours with a working current of 10 amperes. It depends on how much current is used to determine the working time.

The battery does not talk about power, but about “milliampere hour”, which refers to the time it can discharge in milliampere hours, which is its electrical energy capacity. The voltage of the new regular No. 5 dry battery is 1.5V, with an internal resistance of about 1 ohm, and the voltage will decrease during discharge. If the discharge current reaches 500mA, a voltage drop of 0.5V will be generated, and the output voltage will only be 1V. The larger the discharge current, the smaller the total discharge capacity and the shorter the lifespan. The continuous discharge life is shorter.