Unlocking an X5 with a dead battery?

[FunfDreisig]

After reading several threads about electrical 'melt downs' of E70 X5s I began wondering....

1 - Can you unlock the driver's door of an E70 X5 that has a completely dead battery? IOW will the physical key inserted into the driver's door lock and turned, unlock the door.

2 - Has anyone with a battery problem ever been completely unable to get their X5 back running, even after attaching jumper cables in the engine compartment?

BTW this is not market research for yet another Funf Dreisig AG 'must have' X5 accessory -- the Emergency Unlock Device for Dummies (AKA a brick). Not that we didn't think about it. But we decided that even our very best customers (AKA the very biggest dummies) would not carry a brick around in their pockets, in the off chance that their battery might go dead.

Funf Dreisig