Ampere-hour (Ah) capacity is the total charge that can be discharged from a fully charged power battery under specified conditions. The Rated Ah capacity is the nominal capacity of a fully charged Telecom Batteries under the conditions predefined by the manufacturer. A nominal condition, for example, can be defined as 20 C and discharging at 1/20 C-rate. People also use Wh (or kWh) capacity to represent a battery capacity.

Calendar life is the expected life span of the power battery under storage or periodic cycling conditions. It can be strongly related to the temperature and SOC during storage.
Battery reversal happens when the battery is forced to operate under the negative voltage (voltage of positive electrode is lower than that in the negative electrode). It can happen on a relatively weak cell in a serially connected power battery string. As the usable capacity of that particular weak cell runs out, the rest of batteries in the same string will still continue to supply the current and force the weak cell to reverse its voltage. The consequence of battery reversal is either a shortening cycle life or a complete failure.