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2. Capacity

Battery capacity refers to the amount of electricity stored by the battery, represented by the symbol C. The common unit is Ampere-hour, referred to as ampere hour (Ah) or milliampere hour (mAh).

Battery capacity can be divided into Nameplate capacity (nominal capacity) and actual capacity.

3. Internal resistance

The internal resistance of the battery includes ohmic internal resistance and polarization internal resistance, and polarization internal resistance also includes electrochemical polarization and concentration polarization. The existence of internal resistance causes the terminal voltage of the battery to be lower than the battery electromotive force and open circuit voltage during discharge, and higher than the electromotive force and open circuit voltage during charging. The internal resistance of a battery is not a constant and constantly changes over time during charging and discharging, as the composition of active substances, electrolyte concentration, and temperature are constantly changing.

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