Re: Rechargeable Battery for HP-29c



#2

You have to rebuild these yourself. Cut the thin bar between the batteries and replace with NiCad rechargables. Some people have used other types (alkaline NMH) but I am not sure they can be recharged in the calc (of course the alkaline cannot)


#3

Nickle metal hydride cells work great in the Woodstock machines. But, if at all possible, NEVER charge a pack in your 29C or 25C. These machines are very fragile electrically. If your pack is not making good contact or has an open cell, voltages large enough to damage the machine are produced... EVEN IF THE MACHINE IS TURNED OFF!. The other Woodstock machines are a LITTLE more forgiving. At least when the power switch is off, the electronics are truly turned off.

Try to find the external charger stand (hard to find) or a beat up or dead machine (all too easy) to use as an external charger.

Any good battery store (Batteries Plus, Batteries, Etc) can rebuild your old pack for less than 20 bucks. In a pinch you can put a couple of AA alkaline cells in the holder. Just dont connect it them to a charger.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP 50g : More on best rechargeable batteries Miguel Toro 1 613 12-12-2013, 05:31 PM
Last Post: David Hayden
  HP 50g : Best rechargeable batteries ? Miguel Toro 14 1,295 11-16-2013, 03:35 PM
Last Post: Dieter
  HP-29c keyboard dead 2nd row problem Xavier A. (Brazil) 6 712 07-17-2012, 07:09 AM
Last Post: Xavier A. (Brazil)
  Rechargeable 2/3 AAAs in 41C-series Les Wright 7 833 06-14-2012, 12:43 PM
Last Post: Eric Smith
  HP-29C Counterparts Matt Agajanian 2 366 05-12-2012, 06:44 PM
Last Post: Matt Agajanian
  My 29C's even more bizarre behaviour Matt Agajanian 5 635 04-25-2012, 05:46 PM
Last Post: Matt Agajanian
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 343 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  Replacing Rechargeable Batteries on TDS/SMI RAM cards aj04062 2 461 04-12-2012, 11:20 PM
Last Post: Geoff Quickfall
  29C/25C question. Matt Agajanian 7 681 04-03-2012, 12:03 AM
Last Post: Matt Agajanian
  My very schizophrenic 29C Matt Agajanian 9 837 04-02-2012, 05:12 PM
Last Post: Matt Agajanian

Forum Jump: