Re: hp-12c from HP.com arrives with dead batteries Message #2 Posted by Katie Wasserman on 29 Sept 2011, 8:05 p.m., in response to message #1 by Masaki Adachi
The off state current is only a few microamps. That should take many years to discharge the 2032 cells if the calculator shut down properly. You might indeed have unit with a bad CPU or other components that allow for current leakage. However it could be just one bad cell. Since the cells are in parallel a single bad will will drain the other good cell.
Since you're able to measure the cell voltage, you likely have a DMM and that can likely measure current. Put the current meter in series with 3 volts powering the calculator. (2 AA batteries in a holder is easy to find if you don't have an external DC supply.) You should measure around 20ma when running a tight program loop, around .05 ma (IIRC) when on and idle and at most .005 ma when off.
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