When not in use, a battery discharges on a daily basis sometimes up to 0.5-1%. This rate of discharge increases when the climate is warm. To make up for this loss from disuse, a boosting charge should be given once a month.
Refer to How to properly store and maintain your battery.
The following characteristics will tell you if a battery has been properly charged:
VRLA: Valve Regulated Lead Acid
MF: Maintenance-Free
AGM: Absorbed Glass Mat
SLA: Sealed Lead Acid.
In most applications, batteries are installed in an upright position, but in some situations there is a need to tilt them (sometimes at very extreme angles) or lay them completely flat on their backs.
When a battery is in an excessively discharged state, it does not readily accept a standard charge. The battery may appear to be accepting a charge, but charging is occurring only at the surface of the plates.
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