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STATE OF BATTERY CHARGE
The state of charge of a battery is measured by means of the electrolyte density.
Before measuring the electrolyte, ensure that the battery has been at rest for at least 30 minutes (see
previous paragraph).
Remarks: The tables below represent ideal discharge values of lead-acid batteries
It is possible to convert the density (kg/l) approximately into voltage (V) for an indication of the state of
charge.
Formula: Density = (Volt / n° cells) - 0.84
Battery discharge limits
Discharge protracted beyond the established limits makes recharging more difficult, as a longer time is
required.
This happens on batteries that are removed from charging before they have been completely charged.
At the next discharge they may be discharged to an even lower point, triggering an incorrect charge-
discharge cycle which, with time, will cause permanent damage.
Remarks: The acid density limit below which it is not advisable to discharge the battery may be
roughly considered as 1.13 Kg/l.
When the battery has run a long way down, it is important to recharge it as soon as possible.
It is advisable not to leave it completely discharged for more than one day.
Discharging the battery by more than 80% of its capacity means considerably reducing its life
cycle.
Electrolyte density (kg/l)
Discharged capacity (%)
Electrolyte density vs Discharged capacity
RECOMMENDED
DISCHARGE LIMIT
Cell no-load voltage (V)
Discharged capacity (%)
RECOMMENDED
DISCHARGE LIMIT
Cell voltage vs Discharged capacity
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