Something not right here with the question/request---""unplugging the 230 volt charger"????--I don't know of a 230 volt charger---unless this is in Europe---a 120 volt charger---in USA-- but I'll try this---a LED light does not use enough electricity to discharge a battery over night--- do you have another function on this unit such as a compressor or lights--something that maybe on???---another thought is that the battery has failed causing this malfunction----has this been wet/underwater---a malfunction with a diode in the electronics may cause the charger to try and charge the battery via ac and cook the battery as well as the circuit board---this is a real issue here---I'm not getting enough info to give an intelligent answer---i need to know if anything has happen what has happened before and up to this point when this issue started---I don't know what happens if when using these units if you connect to (jump start) battery with reverse polarity--if it bows a fuse or cooks the unit---sorry I can't be more helpful