I got old Toshiba 100CS for a good price. After some inspection, I noticed that AutoResume backup battery and RTC battery are already gone bad, and seems can't hold charge. I've checked eBay for replacements, but only got 2.4V RTC batteries. (I don't bother about main battery because I'm gonna use AC power only.)
So, it seems that these are just plain Ni-MH cells without any circuitry. Therefore, I'm gonna buy some small Ni-MH cells and fabricate one. Is it okay to do this?