Charging NiMH cells on calculators



#2

Hello All,

Does anybody know if it's recommended to charge high capacity NiMH (2500mAH) instead NiCd cells directly on the calculators (i.e. Spice series) using its original rechargers? And what about the other ones (Classic, Woodstock, etc.)?

Thanks!
Luis


#3

Luis; In my humble opinion, it is never a good idea to charge batteries inside a spice or woodstock. Doing so with a bad connection at the battery terminals is what has probably killed many of the dead units you see on ebaby - you know; the ones described as "untested".


#4

I was told by Etienne (one of our fellow collectors and Mr FixIt btw) that Woodstocks don't like rechargeables either and last longer with alkaline batteries.


#5

In my experience they "like" rechargeable cells (NiCd or HiMH) just fine, but it's recommended to recharge them outside the calculator to avoid possible damage.

Alkaline cells provide a higher voltage than the calculators were designed for. I haven't heard of damage resulting from that, but it is going to stress the components more. Many people will tell you that's not a problem, but I personally prefer to avoid it.


#6

I have used alkaline cells in my spices with no bad results but i have always put in slightly used or old ones. I think that it was the inimitable Norm who suggested this, on the age old theory of "couldn't hurt". There are always some used AA cells floating around in something. Still; i prefer nimh that were charged outside the calc.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Safe charging LED HP calcs Anoop Sahal 6 290 03-29-2013, 09:08 AM
Last Post: Anoop Sahal
  Source for N-Cell NiMh Batteries and Charging adapters TnC_Products 14 529 12-16-2012, 10:26 AM
Last Post: Dieter
  Omnibook 300 battery cells Dave Britten 5 298 08-15-2012, 11:54 AM
Last Post: Massimo Gnerucci (Italy)
  Charging Current in HP97, 82143A, 82162A Les Wright 5 273 06-17-2012, 02:11 PM
Last Post: Les Wright
  OT-N cells hide & seek Matt Agajanian 15 451 05-26-2012, 07:53 AM
Last Post: Raymond Del Tondo
  Ok, the hunt is on... Nimh charger solution for N-cell batteries in the USA Gene Wright 34 1,075 06-10-2011, 07:23 AM
Last Post: Bill (Smithville, NJ)
  HP 9114 disk drive battery charging David Ramsey 8 275 05-25-2011, 12:15 AM
Last Post: David Ramsey
  AA NiCad battery cells are now 1100 mAh rated Michael de Estrada 11 373 04-01-2011, 01:17 PM
Last Post: Randy
  Charging times for HP-41 rebuilt battery pack Timo 2 139 01-07-2011, 11:31 AM
Last Post: Timo
  current draw from CR2032 coin cells Eric Smith 5 223 11-04-2010, 12:32 AM
Last Post: hpnut

Forum Jump: