sounds cool!
i got a second intermec battery only by getting a dead intermec. battery came with it and is in very good shape.
anyway seems you never rebuilt any li-ion battery packs, did you? because it CAN be done. so if Sharp fails to get you a battery at a reasonable price, this is still a good route to try. i know some people who rebuilt intermec batteries successfully. or you can take it to a place where they refurbish laptop batteries. the intermec battery isn't more difficult than a laptop battery
(actually it is much easier than a real laptop batt!
)
btw i guess battery's price will probably be around 100$. if it is any less i may be interested
(why not get a third battery
)