Not really my forte but maybe if I pose a daft question or two someone in the know might respond, so here goes. If the bonnet is up while trickle charging would the bonnet switch prevent the bcu from going to sleep? If so and the bcu is kept awake then what would be the possible result (if any) of say a drop in ambient temperature? Could it, for instance, trigger the operation of the rear screen heater? For something to be triggered in the absence of a fault, assuming the battery and charger is proven to be ok, what system/item would draw sufficient current to flatten the battery overnight?
