What kind of rechargable batteries does the SP250 normally come with? My christmas gift to my sister was one of these units, and it came without the batteries, nor one of the headphones. Sonicblue has been absolutly worthless for resolving the situation (no big suprise there, *sigh), and since she tore open the packaging (pretty much mandatory to get it out) the store would not accept it as an exchange.

So, my only hope is to buy a set of batteries for her. I tried NiMH batteries, and they did not charge in the unit like they are supposed to.