Poll: Should I bother with this HP 34C?
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Should I bother? HP-34C in rough shape
05-13-2018, 06:50 PM
Post: #50
RE: Should I bother? HP-34C in rough shape
(05-13-2018 08:31 AM)Dieter Wrote:  
(05-13-2018 05:19 AM)dm123 Wrote:  Regarding the batteries, I know it’s not recommended, but I “flattened” some of my AA rechargeable with a towel over the battery and a hammer.

"Not recommended" is not quite the correct term here... #-\

(05-13-2018 05:19 AM)dm123 Wrote:  Is there a place that sells battery holders that bridge the one side of the pair, like the original holders did, and at the same time allow you to slide out the batteries so that they can be recharged. I’m trying to find out if there is an easy solution to this. I could not find any battery holders like this. This would be the bast solution

FWIW, here is my "best solution" for the 34C: Take a lok in the battery compartment. On the left you'll find the two contacts for + and – while on the right hand side there is a small metal plate – if I remember correctly, I may be wrong here. I removed this plate (if there was one ;-)) and replaced it with a piece of aluminum foil, folded several times. This way two standard Sanyo/Panasonic Eneloop AA cells (with standard button top) fit nicely into the compartment. You can do even better if you replace the aluminum foil with something more suitable.

(05-13-2018 05:19 AM)dm123 Wrote:  Also, another idea I had, is if one could stick a conducting plate on the nonterminal side of the battery compartment of the calculator so that the batteries could be imsertd right into the compartment directly.(with correct polarities ,right directions)

Exactly – I see you got the idea. ;-)

(05-13-2018 05:19 AM)dm123 Wrote:  I could not find any chargers that charge a bound battery pack as a pair, which is the third option,,given that the bound packs are available on eBay.

A battery pack with 2xAA is a standard item that can be found in any decent eletronics store. There are also battery specialists that will build any pack you like from any cells you want. You'll also find smart chargers that are suitable for packs from, say, 1 to 6 cells. These are common items in the RC model world (cars, airplanes etc.), but the most chargers may be overkill for your application.

The solution with two standard AAs and a thin metal connection works fine for me.


Hi Dieter, thanks for your suggestions. Unfortunately there is no metal plate on the 34c, as the original hp battery pack was what bridged the two nonterminal sides of the battery. They sell these packs on eBay, and Andy has a recharger that works with the bound batteries. My recharger has a very thick separator between battery insertions and won’t work unless I break the batteries apart.

I do have aluminum foil tape and used that on the nonterminal side of the 34c battery compartment, but it tears easily when taking out and inserting the batteries.

I’m looking at the other link just sent out at this battery supply place and looking for a thin plate option, to be glued (? Not sure if this is safe due to heat) to the nonterminal side .

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RE: Should I bother? HP-34C in rough shape - dm123 - 05-13-2018 06:50 PM

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