When I first got my 901, I thought I had magic batteries...they lasted like 8-9 hours. I knew that would decrease, but I'm only on my fifth day with them, and they're not only not lasting as long, but they acting totally goofy. They'll seem fine when I first take them off the charger, but very quickly after they'll start acting like they're dying. I'll take them off and then screw them back on and then it will be fine for awhile sometimes, and other times it will just give me a couple more hits and start doing it again. Is there something wrong with my batteries or are all batteries tempermental like this??? Are they any better with penstyles?