3D Printed Replacement Batteries

[Thinkpad4by3]

I saw this eBay listing for those DS2434 chips in thinkwiki's dumb batteries for dirt cheap. Theoretically, could someone make a battery(with better skills than me) with a custom pcb with that chip and readily avaliable batteries for old machines. For the one time you need to play with Encarta 96 @ 640x480 on a plane...