Dvr Dock Burning Through Battery??

[NoodlesKnowles]

ok quick question, I bought an Archos 605 Wifi 30gb(manufacture refurb) w/the dvr dock last year for my birthday gift to myself. All of this sudden (within the last two weeks) whenever I take the PMP off of the dock it dies within minutes, and I mean dies, won't reboot, just a flicker of the screen and instant shutdown, but it works fine if I am watching stuff with it on the dock.

I kept the player on the dvr dock a lot, could it burn out the battery if used constantly? it used to hold a charge all day driving around, I don't want to spend $30 on a battery to find out its a hardware issue, it just seemed to me that when its charging it gets hot, and leaving it on the dock may have been a bad idea, anyone had any similar issues?