Your lucky...mine keeps all the C cells in doors...ever feel like you may be insufficient at times?You need to keep the batteries in the warmth, my wife has got a habit of leaving them in the garage unless they are double A for some reason
I mean...I thought I would go for economy and performance and bought her a "vibrator", from Axminster, but the generator kept the neighbours awake.
Oh...80% off many lines at Ann Summers right now...get them while they still have ears.
On topic. I think, there were issues with older software version on the 07, that meant they didn't display battery life correctly. Which still means your Ego is sh!t hot and your battery is just sh!t, just the your Ego cant be arsed to tell you quite how sh!t