Gregovic wrote:And just as importantly, does the timer restart or can the lock be unlocked if the battery is empty and external power is supplied.
It appears to reset completely when the battery dies, so it'll come back to life thinking it's unlocked. It doesn't appear to save any state to non-volatile memory like the Kitchen Safe does. Of course the Kitchen Safe has accessible batteries, whereas with this lock you can only disconnect the battery or otherwise power it off by opening it up.
One of mine is unhappy, and doesn't seem to be taking a full charge. So I've had a bit of a play to see what it does when it's low on charge. I locked it twice when the display was flashing, the second time with a two hour delay, and both times is unlocked successfully. In a third test much later (with the display very weak) it died when it tried to lock. So for short scenes it looks like you should be OK as long as the display isn't flashing. For longer scenes, I'd be sure to top up the charge before locking up.
If was actually locked, that means just setting the timer for one minute, "locking" it, and waiting for it to unlock, i.e. the same procedure as if you were holding the unlock button when it unlocked and jammed it from unlocking properly. You can do this while the charger is connected, so you don't have to wait for it to charge.
Of course none of this helps if you can't get it to a charger. I figure possible emergency escape methods include cutting with side cutters, brute force, or twisting the lock around so the twisted cable eventually pulls out.