oops...I should mention..mine's a 160GB the battery is not changeable, but it was working perfect before this afternoon.
You can change the battery. I just did and I'm not a geek. I'm a lady. I have the 605 160 gig model. You can't get new batteries from Archos anymore. (Don't even bother to call Archos Support for older models. They charge a fee now for older models and they won't help you.) I got my new battery from newmp3technology.com. Good price too. I paid $35 Canadian which included the shipping. It's a bit of work to change the battery since you have to take it all apart but if you're a bit techy you can do it. The hardest part is unsoldering the wires and soldering the new ones. It's a bit tight in there so you need a fine soldering iron. Some people just cut the wires and splice them. There is a video on YouTube that shows how to do it but the guy doesn't show how to take it apart. He shows how to put it back together. But it's a good guide as long as you keep track of how the parts fit and which screws go where. To remove the hard drive you need an allen key (6 sided). I'm glad I kept my Archos as there is nothing comparable out there. Even tablets like the I Pad are just 32 gigs. I think I saw one that had 64 gigs but it was very expensive. Also, if you decide to change the battery yourself, be aware that the circuit board is a bit tricky to get it back in the case properly. You just have to be carefull and take your time. Mine was still under warranty with Future Shop but they couldn't fix it since Archos doesn't support older models. That warranty was a waste of money. I hate that companies bring out products that are obsolete only 2 years later. PS: In the video that shows how to change the battery, the guy removed the video screen. To do that you have to unsolder a piece. I didn't bother but it did make it a bit more ackward with it attached.