Battery that has not been used for a long time (e.g. the vehicle has not been used), is discharged and, in addition, can be sulfated. If such a battery is charged by a fast charger, it will not accept the charging current or become too fast due to sulfation «fully» charged. Actually the battery is damaged.
Before identifying a battery as damaged, check the following:
- electrolyte density. If the difference between the densities in individual sections does not exceed 0.04 g / ml, then it is necessary to charge the battery with a normal charger;
- After charging, test the battery under load. If the battery specifications are below those listed in Specifications the battery is damaged;
- If the electrolyte density in one or two adjacent sections differs markedly (for example, in five sections 1.16 g / ml, and in the sixth 1.08 g / ml) The battery has a short circuit and needs to be replaced.