The Museum of HP Calculators

HP Forum Archive 10

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HP-97
Message #1 Posted by Mark Monica on 27 Feb 2003, 7:28 a.m.

Any suggestions on where I can find a battery pack for a HP-97 (p/n 82033A)? How can I find out what voltage this battery pack is? Could I bypass with a power supply? Thanks, Mark Monica

      
Re: HP-97
Message #2 Posted by Dave on 27 Feb 2003, 10:50 a.m.,
in response to message #1 by Mark Monica

4 C size NiCads (~4 X 1.25V) or 5 V total. Never bypass the power supply or use adapter without batteries in place. Calc will be fried.

Use ads to get battery pack, they can be rebuilt cheaply at BAtteries Plus.

            
Re: HP-97
Message #3 Posted by Dave Shaffer on 27 Feb 2003, 11:12 a.m.,
in response to message #2 by Dave

re: "... Never bypass the power supply or use adapter without batteries in place. Calc will be fried."

While this may be true for the usual/normal el-cheapo wall socket power adapters (batteries act like super-duper capacitors in this case, to regulate and smooth out any variations from the supply), you ought to be able to use a well-regulated power supply as a stand-alone, non-destructive substitute.

re: "... they can be rebuilt cheaply at BAtteries Plus."

Good idea. I got a battery pack rebuilt for my father's '97 a couple of years ago at Batteries Plus - it took only a day or two and $20 (parts and labor).

                  
Re: HP-97
Message #4 Posted by Mark Monica on 27 Feb 2003, 11:58 a.m.,
in response to message #3 by Dave Shaffer

Thanks for the info, I have the old pack but the batteries (or super capacitor) must be open. When the adaptor is plugged in the calculator with the battery installed, it's dead. I am getting voltage thru the adpator. I think I should try running the unit off 4 C size batteries (WITHOUT the adaptor) before I try to get the orginal battey pack repaired.

                        
Re: HP-97
Message #5 Posted by Christof on 27 Feb 2003, 1:46 p.m.,
in response to message #4 by Mark Monica

you might not want to use 4 regular C batteries, though if you go to rat shack and grab a 4 cell holder and 4 *nicad* (1.2 volt, not 1.5 volt like alkalines) batteries, you can test that way.

before you try much of anything, realize that a repaired battery pack is worth as much to someone here as you pay to get it rebuilt even if the 97 is dead. So it is worth getting the batteyr pack repaired anyway.

I always rebuild my own packs, as it isn't really very hard.

(you should be able to function test off *any* 4 cell nicad pack, so using a cheap 4 cell (4.8 or 5 volt will be printed on the package) cell phone battery pack should allow for testing. I keep a few of those around for that reason, too.

don't mix the + and -, though- I don't think you have a short protection in the 97

      
Re: HP-97
Message #6 Posted by David Smith on 27 Feb 2003, 5:56 p.m.,
in response to message #1 by Mark Monica

The cells used are the "sub-C" size... NOT C sized. Just take your old pack to your local battery store and they will know what to do.

      
Re: HP-97
Message #7 Posted by Sambonator on 28 Feb 2003, 12:15 a.m.,
in response to message #1 by Mark Monica

Try EBay. Here's a link to a battery for it:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3009562800&category=11713

Sam


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