Hi all gurus, nerds and smarty pants :-) May I pick your brains???

I have one Pronto TSU 2000 that does not have a battery pack. My other Pronto does have the battery pack and charger. Can I solder some NiMh batteries together so I can charge the other Pronto on the charger base? If so, how??

Any pics or tech help would be greatly appreciated!!! Thanks!!!

Ron drof2th@aol.com