HP 2113e Battery resistor
J. David Bryan
jdbryan at acm.org
Sun Jun 21 23:30:10 CDT 2015
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.
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