The amount of energy that can be obtained from a single cell by unit mass or unit volume.

Measured in units of Wh/kg or Wh/I.

Continued charging after the cell has reached a fully charged state.

In general, charging a battery more than necessary can adversely affect its safety and electrical characteristics.

Continued discharge after cell voltage falls below the determined cut-off voltage.

In general discharging a battery more than necessary can adversely affect its safety and electrical characteristics.

The voltage that can be obtained from a battery under normal conditions.

It is used to show battery voltage.

When battery capacity declines without current flowing to an outside circuit.

In general, even when a battery is left unused, internal chemical reactions will cause its electrical charge to decrease.

The voltage which indicates the limit at which discharge stops.

Since this roughly corresponds to the actual usage limit, a battery that has fallen below this voltage is considered to have exceeded its service life.

Amount of energy used in charging a battery. For constant current charging, this is the product of current and charge time.

It is measured in units of ampere-hours (Ah).

Characteristics shown according to the time needed for each charge/discharge cycle when cycling charge/discharge under set conditions.

Also referred to as "cycle characteristics".

Discharge with a relatively high current compared to the battery capacity. This is carried out for purposes such as quick charging.

Also referred to as "high-rate" discharge.

The standard amount of energy which can be obtained from a cell in a fully charged state under set temperature, discharge current, and cut-off voltage conditions.

It is measured in units of ampere-hours (Ah) or milliampere-hours (mAh).

A battery that was produced within the past month, which has undergone less than 5 charge/discharge cycles. Even when new, self-discharge will cause the charge to decline.

Batteries generally have a recommended expiration date.

A battery's electrical capability. This is the amount of electricity that can be extracted from a battery from the time you begin using it until the cut-off voltage is reached.

It is measured in units of ampere-hours (Ah) or milliampere-hours (mAh).

Ratio of initial charged cell capacity measured under set conditions after storage for a fixed period of time, over average capacity (assumed value of 100).

Ratio of the maximum capacity obtained from a cell under set conditions that has been stored for a fixed period of time and charged a fixed number of times, over average capacity (assumed value of 100).

When electrolyte fluid from inside the battery leaks to the battery's outer surface.