HP Forum Archive 19

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HP 34c battery voltage voltage Message #1 Posted by Hiawatha Wheelwright on 14 Jan 2010, 11:54 a.m. I have a new hp34c that came with 1.5 volt off-the-shelf alkalines installed. I was concerned about any physical stress that the slightly too-long batteries may have been causing on the PCB, so I bought a pair of rechargable tip-less NiCds. The battery clips in the calculator have been flattened out because of the alkalines, and I did not want to bend them back out, so I padded the extra space with some tin foil and the new NiCds are a perfect fit. But I am now concerned that they are 1.2 volts instead of 1.5 volts. Will this slightly lower voltage be a problem for the calculator? hpmuseum's battery spec page recommends a pair of radio shack NiCds which are also 1.2 volts.

Re: HP 34c battery voltage voltage Message #2 Posted by Marcus von Cube, Germany on 14 Jan 2010, 12:32 p.m., in response to message #1 by Hiawatha Wheelwright NiCd always are rated 1.2V. This was equally true for the original batteries in the calculator. So 2.4V is certainly ok.

Re: HP 34c battery voltage voltage Message #3 Posted by designnut on 15 Jan 2010, 1:55 a.m., in response to message #2 by Marcus von Cube, Germany Whenever you see the word NiCad think instead Nimh. The are more modern without the memory effect of Nicad. I have had such good results with the low self discharge Sanyo Eneloop cells I can recommend them for any service. They hold enough charge tto last over a year. Sam

Re: HP 34c battery voltage voltage Message #4 Posted by Hiawatha Wheelwright on 15 Jan 2010, 1:56 a.m., in response to message #2 by Marcus von Cube, Germany Great, thanks. Oddly enough, I let it charge for about 6 or 7 hours and the low battery indicator still comes on when I power up the calculator.

Re: HP 34c battery voltage voltage Message #5 Posted by Vieira, Luiz C. (Brazil) on 15 Jan 2010, 10:16 a.m., in response to message #4 by Hiawatha Wheelwright Hi; Chances are that the connection for the charger is faulty. I repaired (and replaced) many of the flex circuit that connects both the batteries and the charger input to the power board. If you have the means to, please check if the charger is actually feeding the power board. Success! Luiz (Brazil)

Re: HP 34c battery voltage voltage Message #6 Posted by John B. Smitherman on 15 Jan 2010, 10:40 a.m., in response to message #1 by Hiawatha Wheelwright I've used 2 AA alkaline batteries in my 34c for 5+ years with no problem. I open the battery compartment every year to do an inspection looking for battery leakage. Regards, John

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