Why does my DualShock 3 lose power even when it's not on?

[twesterm]

JOKA_ said:
I had a controller once that just refused to charge, so once it ran out it was gone. Maybe you have a bad one like I did (It was a SIXAXIS btw)

 

My SIXAXIS is another story.  It charges but I get an hour or two of play out of it.