Me too. I always rest the charger in the boot and clip it to the battery.I always did on my 2000 2,0 Z3 with no ill effects.
Tony.
So do I, 5 amp trickle charger...very convenient...I plug into the cigarette lighter, very convienet.
If that is the case then you can't open the boot or the light coming on will blow you to smithereens.If you close the boot whilst charging which you might do if outdoors, be aware that flammable gas can be evolved from the charging process. If this gas accumulates in the closed boot then a spark from the disconnection of the croc clips after charge completion could be very dangerous - explosions have happened apparently. This is why the under-bonnet method is recommended in the manual.