HP Forums
How to change batteries on HP 21 - Printable Version

+- HP Forums (https://archived.hpcalc.org/museumforum)
+-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html)
+--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html)
+--- Thread: How to change batteries on HP 21 (/thread-53580.html)



How to change batteries on HP 21 - raze - 03-10-2004

Hello All,

I just got a HP 25, but I don't know how to change the battery pack. It uses 2 batteries, but I don't know how to take them out.

Any help will be greatly appreciated.
Thanks




Re: How to change batteries on HP 21 - Jim Creybohm - 03-10-2004

I have done this also on my old 25, and you can see a seam along the edge of the pack just above the back of the battery pack (i.e., the outside). You can carefully remove the back from the "frame" of the pack and pull the batteries this way. NiCad AA batteries work very well for this.

Also, Katie Wasserman has written a very good article on this topic:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=335

There are other articles and as I find them I'll put them up also.


12345


Re: How to change batteries on HP 21 - Bill Duncan - 03-11-2004

I managed to replace the cells in one of my packs by cutting one end of the bar which runs along down between the cells. by carefully bending this partway I was able to get both cells out. I replaced them with 1200mAh NiMh cells several years ago and they work just fine. I charge them a little longer than normal with the standard HP charger.

Hope this helps.