Nimh may be charged safely from nicd charging circuits, generally, and the low discharge rate from a M100 (IE: not a power tool) means discharge rate is no problem either, but avoid trickle charging for more than a day. Charge up and remove from power. And only nimh or nicd nothing else on a charging circuit that was made for nicd.
On Thu, Nov 1, 2018, 9:07 PM Anthony Coghlan <[email protected] wrote: > Thanks, Jim, for pointing out that procedure. The Sercice Manual copy on > Club 100’s site is clear on how to do that. I may try it. You’re right - > it would have been so nice to have the jumper wire locations easily > accessible - even to have had actual jumpers to just add or remove as > desired. That would have been too easy for the end user. :) > > However, do you think I’d run into problems with charging speed or > capacity if I use standard NiMH batteries available off the shelf today? > I’m hoping not. > > I believe the 102 is harder to access than the 100, but does anyone know > of a similar mod for the 102? > > Best wishes, > Anthony > > > > > On Thursday, November 1, 2018, Jim Anderson <[email protected]> wrote: > >> > -----Original Message----- >> > >> > Hi, everyone - for the M100, there was a simple (doc available off our >> > site) resistor modification so that rechargeable batteries could be >> > charged when the computer is plugged in. Seems to work fine. >> > >> > Is there any such (relatively simple) modification for the 102, 200, or >> > 8201? Thanks. >> >> There's a relatively simple mod Tandy made provision for in the T200 >> which enables charging of NiCd batteries (and, iirc, modifies the low >> battery indicator behaviour appropriately). It's documented in Appendix >> A-1 of the T200 Service Manual and involves soldering two jumpers into >> through holes provided for this purpose on the memory PCB (J301 and J302). >> They even made provision for putting a screw in the battery door (and >> putting a red label on it) to keep the user from replacing the NiCd >> batteries with alkalines after the mod was done. >> >> It would have been really nice if they had made the jumper through holes >> accessible from the RAM/ROM compartment, but they're just far enough off to >> the side and you have to take most of the machine apart to get to it. This >> isn't a huge deal imho if you've taken electronics apart before, but the >> flex cable for the screen can be a challenge if you haven't dealt with it >> before. The Service Manual has detailed disassembly instructions on pages >> 2-1 through 2-4. >> >> >> >> >> >> >> >> jim >> >
