When a battery that has not been used for a long time is charged by a boost charger, it does not accept the charging current or, due to the so-called surface charging, shows signs of being fully charged too quickly. Apparently, this battery has a defect.
Before recognizing the battery as faulty, it must be checked:
- Check electrolyte density. If the density of the electrolyte in individual cells differs by no more than 0.04 g/ml, then the battery must be charged in the normal mode of operation of the charger.
- After charging, check the operation of the battery under load, see the relevant chapter above. At the service station, a special measuring device is used for this. If the measured voltage is below 9.6 volts, then the battery is faulty.
- If the density of the electrolyte in one or two adjacent cells has dropped noticeably, then the battery has a short circuit and is faulty.
- Charging a heavily discharged and sulphated battery is described in the appropriate chapter above.
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