Three indicators of dry battery.

1. Nominal voltage, generally speaking, is the road terminal voltage during normal operation, strictly speaking, it is the average voltage of the time from the voltage value of the new battery to the lowest voltage value. The voltage of a new battery or a battery that has just been charged will be slightly higher than the rated voltage, and it will fall to this value immediately after it is used, and it can remain at this value for a long time thereafter. When it is lower than this voltage, the battery voltage will drop relatively quickly until it can no longer be used.

2. Capacity: The electric energy of the battery, generally mAh, 500mAh means that the battery is discharged at a current of 50mA and can work for 10 hours. This kind of measurement is rough, because the working time is not linearly proportional when batteries of different nature are discharged at different currents. Therefore, the stricter battery capacity is expressed in terms of how many ohmic resistances can be discharged and how much time, and there are differences in discharge methods such as continuous, gap, and short-term. For example, for a certain brand of alkaline battery, for a 10 ohm load, the continuous discharge time to 0.9 volts is ≥ 20 hours; for a 1.8 ohm load, the discharge time is 15 seconds per minute, and the number of discharges to 0.9 volts ≥ 660. The discharge conditions of the former are equivalent to larger tape recorders or ordinary electric toys, and the latter are similar to flash charging. The more novel and high-quality batteries, the better the linearity of the capacity.