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LIFELINE AGM BATTERIES
Document No. 6-0101 Rev. F Page 27 of 40
APPENDIX A – GLOSSARY OF BATTERY TERMS
AGM - Stands for Absorbed Glass Mat. This is the separator system used
in all Lifeline
® AGM
batteries.
Active Material - Electrode material which produces electricity during its chemical
conversion. In the positive plate it is lead dioxide. In the negative
plate, it is sponge lead.
Ampere - Unit of electrical current abbreviated as amps or A.
Amps = Watts/Volts or A = W/V.
Ampere Hour (Ah) - The capacity of a storage battery is measured in ampere hours.
One ampere hour is defined as a current flow of one ampere for a
period of one hour. Five ampere hours means a current flow of
one ampere for five hours, a current flow of 2.5 amperes for 2
hours, or any multiple of current and time that will result in five.
This relationship can be expressed as follows:
Capacity (Ampere hours) = I*T, where I is the current (in
amperes) and T is the time (in hours). The capacity of a storage
battery is based on a given discharge rate, since the capacity will
vary with the rate of discharge.
Boost Charge - A charge applied to a battery which is already near a state of full
charge, usually of short duration.
Capacity - The quantity of electricity delivered by a battery under specified
conditions, usually expressed in ampere hours.
Capacity, Rated - A designation by the battery manufacturer which defines the
performance of a new battery at a defined rate of discharge. For
Lifeline
® AGM
batteries, the rated capacity is based on the 20-
hour rate.
Capacity, Residual - Capacity remaining at particular point in time and set of operating
conditions, usually at a partial state of charge condition.
Cell Reversal - Reversing of polarity within a cell in a multi cell battery due to
over discharge.
Charge - The conversion of electrical energy from an external source, into
chemical energy within a cell or battery.
Charge Rate - The rate at which current is applied to a cell or battery to restore
its capacity.
Charge Retention - The ability of a charged cell or battery to resist self discharge.
Charge, State of - Ratio of the amount of capacity remaining in a battery to the
capacity when fully charged. A battery at 25% state of charge
has 25% capacity remaining versus what it could give if fully
charged.
Charger - Device capable of supplying electrical energy to charge a battery.
Charging - The process of converting electrical energy to stored chemical
energy. The opposite of discharging.
Charging Efficiency - Ratio of the Ampere hours delivered on discharge to the Ampere
hours needed to fully charge a battery.
Conditioning - A special constant current charge process used to restore a
battery’s capacity after extended storage periods or deep
discharge exposure. Also known as reconditioning.
Constant Current (CC) Charge - Charging technique where the output current of the charge source
is held constant. Warning! This procedure may damage the
battery if performed on a repetitive basis.
Constant Voltage (CV) Charge - Charging technique where the output voltage of the charge source
is held constant and the current is limited only by the resistance of
the battery and / or the capacity of the charge source. Also known
as Constant Potential (CP) charge.