Just a thought here - many (most?) rechargeable AA size (and AAA size) batteries are lower voltage than standard alkaline batteries.
An alkaline 1.5 volt AA can be replaced with a rechargeable AA, but the rechargeable is usually labeled 1.2 volts. They're the same physical size, but supply different voltages. Thus, alkaline 4x1.5 volts = 6 volts. But rechargeable 4x1.2 volts = 4.8 volts. Tom M. On Tue, Apr 23, 2019 at 7:58 AM Jeffrey Birt <[email protected]> wrote: > What sort of T do you have that has rechargeable batteries? > > > > Jeff Birt (Hey_Birt!) > > > > *From:* M100 <[email protected]> *On Behalf Of *Fugu ME100 > *Sent:* Tuesday, April 23, 2019 1:49 AM > *To:* [email protected] > *Subject:* Re: [M100] Non-charger > > > > Sometimes a cold boot can help after a NiCd battery replacement. > > > > Then check the Vdd and Vee voltages are +5V and –5V respectively. The > voltage on the battery should be about 3.7V if it is charging OK. > > > > It could be powering on just the screen is dim. Try powering on, hit > return (this takes you to BASIC) and then type BEEP and return. There > should be a beep if the unit is powering up but the screen is not working. > If the screen is dim the –5V (Vee) might be really low. > > > > The memory protect switch is set correctly? I routinely forget to set > this switch correctly when I take a machine out of storage :( > > > > *From: *M100 <[email protected]> on behalf of Chris > Fezzler <[email protected]> > *Reply-To: *<[email protected]> > *Date: *Tuesday, April 23, 2019 at 12:31 AM > *To: *Model 100 Discussion <[email protected]> > *Subject: *[M100] Non-charger > > > > I took a Model T out of storage and it was completely dead and would not > take a charge. > I figured I'd use the opportunity to replace internal battery anyway. > > Installed the new battery and it started right up, albeit with a Low > Battery light. So I assumed it just needed an overnight charge and would > be as good as new. > > > > Just got home from work and it is dead as a doorknob again after being > plugged into wall wort. > > > > I can solder and have a digital multimeter. Some clues on what to check? > I assume it is not charging. > > > >
