Translations:Fonctionnement, entretien et régénération de batteries au plomb/21/en

The units of the batteries are indicated as abbreviations which are not always easy to understand. Here is a summary table of the units associated with the batteries :

Capacity (Ah) Energy (Wh) Discharge rate, C_xx Cold Cracks Amps (CCA) SOC (State of Charge) DOD (Depth of Discharge) Number of cycles


Characteristic	Definition	Explanation
The amount of current that a battery can store or release, usually specified in Ah for a given discharge rate.	A 10 Ah battery can produce 5 Amperes (A) for 2 hours (h).
Tension (V)	Battery voltage level. It must be compatible with the connected devices.	Lead-acid batteries are made up of units delivering 2.1 Volts (V) and connecting these units in series makes it possible to reach the generally desired voltage. For example, six units connected in series deliver 12 V. To create 24 V or 48 V systems, 12 V batteries are, in turn, connected in series.
The product of multiplication of the capacity by the voltage.	A 200Ah 24V battery will have an energy of 4800 Watts hour (Wh).
Expressed as a unit of C₁₀, C₂₀or C₁₀₀, it indicates the capacity of a battery according to its rate of discharge.	50Ah C₂₀battery means a battery of 50Ah capacity with 20h discharge C₁₀₀battery: 90Ah (capacity of 90Ah with a discharge in 100h).
This is the maximum extractable current from a battery over a short period when starting the engine, for example.	CCA 420A 5 sec indication means the battery can deliver 420A for 5 sec.
State of charge of a battery, which indicates the amount of electricity remaining.	SOC = 50 %: the battery’s charge is 50%.
State of discharge of a battery, or the amount of electricity consumed.	DOD + SOC = 100% .
For a battery, a cycle represents a discharge followed by a charge. The number of cycles of a battery depends on the depth of discharge or amount of electricity consumed. The higher the DOD, the lower the cycle life, the same battery can have.