Glossary for frequently used terms
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D
Deep-Cycle Battery
A type of lead-acid battery having thicker plates and more robust construction that can withstand many discharges to a low state-of-charge.
Deep Discharge
Withdrawal of 50-80% or more of electrical energy to the end-point voltage before the cell or battery is recharged.
Depth of Discharge (DOD)
The percent of rated capacity to which a cell or battery is discharged. For example, if 25 Ah are removed from a 100 Ah battery, it's depth of discharge is 25% and the battery is at a 75% state of charge.
Discharge Rate
The current at which a battery is discharged (C-Rate).
Disconnect Voltage
Battery voltage at the end of useful discharge or below which the connected equipment will not operate or may be damaged. Also referred to as cutoff voltage.
Dry Cell Battery
1) A battery having electrolyte in the form of a solid, powder, or moist paste.
2) Some Gel Cell and AGM battery manufacturers classify their batteries as dry cell batteries as the liquid electrolyte has been immobilized and can not leak.
3) A wet battery that, for the purpose of safe shipping or long term storage, does not have the electrolyte added until the battery is needed.
dT/dt
A charge termination criterion based on the rate-of-temperature-increase of the battery as it approaches full charge. Typically used with NiMH batteries, but may be used with other chemistries.
