Its a long story but I have a 1994 280SL with a totally flat battery, which is in the boot. I inadvertently shut the boot with the only key I have, inside the boot. I have managed to wrench the boot lid up and using a magnet on a stick I have recovered the key. Is the boot lock operated by vacuum (of which I have none so the engine would need to start to get some) or is it operated electrically (of which I have none so I would need to charge the battery) or is it operated mechanically by the key which I do have, and I have tried, but the effort of lifting the boot lid by two inches to recover the key may have mangled the lock mechanism. I would love any suggestions as to how to charge the battery and get the boot open. Of course if I can get the boot open first, I could then charge the battery. I guess I could charge the battery with the ignition on position 1, and wire up a charger to the cigarette lighter socket.