If I unplug mine with a full charge, it'll be dead within a few days. Something is sucking the battery dry even when off. Both my units are the same. I predict we will all have dead batteries sooner than we should.

2xAA
M80/VP150/VP160/QS8
4xM3/M22OW/M2OW/VP150OW/4xM3IC/4xM3OW
EP500/800/HSU VTF3/SVS PB2k/SB2k/SB-12