PIC backup power supply: switchover ???

[skimask]

Skimask, the "crazy flying tiger"...

?????

I need some power supply in the mag while it is out of the gun, it cannot sleep because player interacts with the pic inside the mag while it is away from the main power supply. See?

So don't sleep! Sounds to me like the 'mag' is going to be fairly simple anyways. It'll take a LONG time to deplete a few AAA batts.