To ensure successful charging of the battery box, the following steps must be followed in the order indicated:
Charger is disconnected from the mains (must not be connected to 230 VAC!)
Connect charger and rechargeable battery
Connect charger to mains (230 VAC)
<Charging in progress...>
Bulk LED = charging in progress
Absorption LED = charging in progress
Storage LED = charging process completed
Disconnect charger from mains (must not be connected to 230 VAC)
Wait <30 seconds>
Disconnect charger and battery
Test: After successful charging, the voltage of the battery should be at least 13.5 VDC