The Museum of HP Calculators

HP Forum Archive 20

[ Return to Index | Top of Index ]

LiPo rechargable for 41 pack rebuilding?
Message #1 Posted by Craig Ruff on 11 Jan 2012, 11:26 p.m.

Has anyone thought about using a small 2S LiPo battery pack for rebuilding an 82120A? A quick search found a small 120 mAh 7.4V pack (E-flite EFLB1202S20) that should fit with room to spare (30mm x 20mm x 9mm). It would need 3 diodes inline to drop the voltage to the calculator, and it looks like the standard LiPo charging connector might fit in the recharger connection opening.

      
Re: LiPo rechargable for 41 pack rebuilding?
Message #2 Posted by Juergen Keller on 12 Jan 2012, 3:03 p.m.,
in response to message #1 by Craig Ruff

There was a discussion about using LiPo batteries on this forum.

Google is your friend, e.g., search for:
82120a lipo site:hpmuseum.org

            
Re: LiPo rechargable for 41 pack rebuilding?
Message #3 Posted by Craig Ruff on 12 Jan 2012, 6:01 p.m.,
in response to message #2 by Juergen Keller

Doh! I only looked in the article section. I think using a 2 cell LiPo pack with voltage dropping diodes should work fine. I'll have a look at running a bench top test before going to the effort of retrofitting an old nicad pack case.


[ Return to Index | Top of Index ]

Go back to the main exhibit hall