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.

                                      -- Dave

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