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CHARGE ACCEPTANCE TEST Test of batteries to check whether or not they are adequately recharged after discharge.

CHARGING EFFICIENCY General term for ampere-hour efficiency and watt-hour efficiency. In many cases, however, it means the ampere-hour efficiency.

CONSTANT CURRENT CHARGE A method of charging: to charge a battery with a constant current.

CONSTANT VOLTAGE CHARGE A method of charging: to charge a battery by applying a constant voltage to the terminals.

C-RATE A charge or discharge current rate expressed in A or mA. It is numerically the same as the hour rate capacity of a battery expressed in Ah of the rated capacity.

CUT-OFF VOLTAGE OF DISCHARGE The terminal voltage of a battery at which discharging should be discontinued. This voltage depends on discharge current, type of electrodes and construction of battery.

CYCLE LIFE The number of charge/discharge/rest cycles a cell/battery can provide. Cycle life is usually expressed by the number of cycles available before duration of discharge decreases to a half of the initial value.

DEPTH OF DISCHARGE A value to express the state of discharge of a battery. The depth of discharge is generally expressed by the ratio of discharge amount to rated capacity of the battery.

DISCHARGE To draw off the electric energy stored in a cell/ battery.

Glossary of main battery terms


A plastic material largely used for the case and cover of batteries.

  • ACTIVE MATERIAL The substance which electrochemically reacts in the electrode of batteries. Lead-acid batteries adopt lead dioxide for the positive electrode and spongy lead for the negative electrode.

  • AMBIENT TEMPERATURE Average temperature in the vicinity of the battery.

  • AVAILABLE CAPACITY The capacity actually available from a cell/battery. The available capacity is the capacity of a battery when it discharges at a specified hour rate, and expressed in hour rate and Ah.

  • BOLT FASTENING TERMINAL A type of battery terminals, to which lead wires are connected with bolts.

  • BUILT-IN THERMOSTAT The built-in thermostat is a resettable switch built in a battery for temporarily cut off the battery circuit when the temperature of the battery exceeds a preset value or when the battery charges/discharges at a higher rate than predetermined.


The electric capability of a battery. It usually means ampere- hour capacity expressed in Ah or C (coulomb).

  • CELL

The minimum battery unit which composes a storage battery. Nominal voltage of the cell of the lead-acid battery is 2 V.


The operation of supplying a battery with a DC current from an external power source to have the electrode active materials conduct chemical reactions then to store electric energy as chemical energy in the battery.

Sealed Lead-Acid Handbook, Page 73

January 2000

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