A while ago I saw a howto on hacking a Tandy 200 to fit a fifth rechargeable battery but I can't for the life of me find it again. I'd rather not reinvent the wheel, so if anyone has any clues, I'd appreciate it.
—b9 On Mon, Jun 20, 2022 at 11:31 AM you got me <ven...@hotmail.com> wrote: > One option might be to install 5 ni-mh cells. 4 in the regular place and a > 5th inside of the m100. Then have a ni-mh charging circuit (widely > available) in line with the 6v adapter socket of the m100. So, while the > m100 is plugged in, it charges the batteries. > > Also, I believe there were previous discussions about replacing the memory > ni-cad with a super capacitor. > ------------------------------ > *From:* M100 <m100-boun...@lists.bitchin100.com> on behalf of Allan > Zieser <all...@ottsen.com> > *Sent:* Monday, June 20, 2022 12:55 PM > *To:* m...@bitchin100.com <m...@bitchin100.com> > *Subject:* [M100] Rechargeable batteries > > > I have noticed that with rechargeable batteries the active life for the > Model 100 is shorter. This is because most rechargeable batteries follow a > curved path for power drain. They only maintain the 1.5 volts for s short > time then tend to drop lower for the remainder of their power drain. When > the power drops low enough the Model 100 activates the low power light and > then goes down. > > > > There are some exceptions to this discharge path. The EBL rechargeable > batteries hold the 1.5 voltage across their drain, however then they drop > off sharply causing a shutdown when they are at the end of the discharge > cycle. Not really an issue for me as I use the Rex and Jeff’s backpack so I > can save often on projects. Just some of the tradeoffs I have noticed when > using rechargeable batteries. > > > > In regards to the backup battery, the advantages do outweigh the > disadvantages. If you are only running on installed batteries then the > backup battery will recharge from them continuously, reducing the battery > life. However if you use a wall outlet or usb power cable then it will > extend the life of the batteries by charging the backup off of the power > cable instead of the installed batteries. > > > > I have considered installing NiCad’s, however this requires a little > soldering, so I am not sure if it is worth it. For now I just use a > combination of the EBL batteries and a USB power cable I found on Ebay that > works really well. > > > > Just my observations on this. Please correct me if I am wrong in any of > this. Have a great week! > > > > -Allan Zieser > > >
