you may have messed up the electronic settings if you did not remove one end of the battery cable from the battery before charging. this will probably require resetting my the dealer.
Hi Robert, No it is not normal for the coolant level to drop at any time. The BMW has a system which must be bled to free it of all air. The bleed screw is situated on the radiator and has a screw driver slot. Open the bleed screw and replace the coolant with the recommended coolant and then finish topping up with water until all bubbles have cleared from the system. Observe the level and if it drops again have a pressure test carried out on the system as if the level drops again, there must be a leakage. Likely places are hoses, and the water pump. If it is the water pump, the leakage may only be evident during engine operation, unless the leakage is severe in which case you will notice coolant dripping. Regards John
If you have a multimeter remove and test the fuses for continuity (OHMS) as fuses can look OK but they have blown. If your replacing fuses ONLY replace the with one of the Same colour and Amp rating.