The rechargeable batteries for my mp3 player bit the dust. The batteries chage in the player itself, and it says that you should only use their type of rechargeables. I figured that it's just marketing, and they batteries are batteries. Anyone have experience violating the manufacturers warnings, before I toast my equipment?

You have to look out what kind of recharchables they are, I think NiMH instead of NiCd. The former is better then the latter. If they look like normal AA or AAA batteries then I think you can just replace them with another brand.

In most cases it is just a marketing scam, but hey, thats how they attempt to make money these days. Nothing is honest anymore.

I contacted them since I can't find their batteries anywhere (not even on their own site), and they admitted I can use any kind of batter as long it is the same type. NiMH I think.