GLOSSARY OF TERMS FOR SEALED LEAD-ACID BATTERIES
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).
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