Good morning.. I wonder can anybody help. We have a Bessacar, two birth on a Fiat ducatto base. Every time we leave the motorhome in Storage for a month, the engine battery is absolutely flat, dead ! I switch everything off inside, detach the leisure battery each time. I really don't understand why this is happening. Does anyone have any ideas?? It's driving me mad and feel I want to sell the damn thing, but I love it and don't actually want to that. Please help. Thanks in advance ... Lizi