On Sunday, June 21, 2015 at 16:43, Marc Verdiell wrote: > On this machine the battery connectors are just two pronged, + and -, > so no thermistor connection apparently.
That marks it as an "A-version" power supply. > I just need to find new small 12V lead batteries that fit. Note that the "A" supply used a 12 Volt nickel-cadmium battery pack (per page IXA-1 of the M/E/F-Series ERD), and the charger is a constant-current supply. The pack is not broken down in the parts list but presumably would have contained ten 1.2-Volt cells. The "B" supply used a 14 Volt lead-acid battery pack (ERD IXB-5), so seven 2.0-Volt cells, and the charger is a constant-voltage supply. If you use lead-acid batteries with the "A" power supply, you may wind up overcharging them and shortening their life. -- Dave