just to follow up to this post. i called both of the places listed above the $99 place no longer has them in stock the $58 .. actually doesn't have that in stock either.. they have the sony replacement for $75 plus $10 shipping $85 is just way to much to pay for a battery.. The minidisc units that accept the batteries are pretty scarce on ebay..so not much luck their either. it's a shame there isn't another way or another source of power that can be used internally.. i too have the 3 AA battery attachment that hangs by a cable..but that's really a pain.. anyways.. if anyone finds a source..let this thread know please.