Technical info - Accu laadt niet op
Battery does not charge
If a battery, in spite of a properly functioning and connected charger does not charge, the battery is has most likely fallen victim to sulfation.
Sulphatation results from two factors: state of charge and the time the battery discharged. Sulphatation not only hampers the charging process, but it can also form large crystals which bridge between two plates and cause a short circuit. In the event of such a short circuit the battery voltage will rapidly increase when connected to a charger. The charger will see this as an indication that the battery is fully charged and cut off, leaving the battery empty.
Sulfation always comes with a permanent loss of capacity. Mild sulfation in a flooded battery can sometimes be mended using a suitable charger, but doing so is time-consuming and full recovery may not be expected. .