also AAA's would be better in this application. Think remote control? would you use rechargeable's in remote ? no they run so long its annoying. in this the AAA's would run EVEN LONGER than the lithium battery pack. You would have to change the batteries MAYBE once a year if that. and for this benifit you NEVER have to worry about a "non easily removable" impossible possibly to replace battery pack dying on you rendering your otherwise perfectly good gadget useless.
In something like a PDA where you have to charge it sometimes DAILY or a cell phone FINE but in something like this rechargeable is counter productive. It runs sooo darned long that it silly not to use simply long lasting alkalines.
Chris Taylor
http://www.nerys.com/