From the threads I've read, there doesn't seem to be a "battery replacement" plan at the moment, reason given is that the battery will not easily die.

The only positive comment made was in reference to the iPod, where it was said that 3rd party replacements sorted out the problem. So, you'd better hope the Karma is sucessfull otherwise there'll be no options available apart from return to rio and hope for the best.

My personal thoughts are,... that by the time you need one it will be available from somewhere

Cheers, Sim