HP 2113e Battery resistor

J. David Bryan jdbryan at acm.org
Tue Jun 23 23:55:06 CDT 2015

On Tuesday, June 23, 2015 at 11:42, Marc Verdiell wrote:

> Thanks David.

You're welcome.

> I might put NiMH batteries instead....

That may not be advisable, given the continuous constant-current trickle 
charger in the CPU power supply.  The Panasonic "Nickel Metal Hydride 
Technical Handbook" recommends charging for no more than 10-20 hours, 

  "The overcharging of nickel-metal hydride batteries, even by trickle
   charging, causes a deterioration in the characteristics of the
   batteries.  To prevent overcharging by trickle charging or any other
   charging method, the provision of a timer to regulate the total
   charging time is recommended." 

Panasonic's "Nickel Cadmium Batteries Technical Handbook," on the other 
hand, says explicitly that continuous trickle charging for Ni-Cds is a 
recommended charging method.

                                      -- Dave

More information about the cctalk mailing list