Re: HP-94 question Message #6 Posted by Katie Wasserman on 30 Mar 2013, 12:46 p.m., in response to message #5 by aj04062
Yes it's near the top. (You must not actuality have a 94 in your possession, it would be extremely obvious).
Replacing the cells in the battery pack is about as difficult as it gets. The pack is welded shut and you need to cut it open, there's just no other way. I use a Dremel tool with the tiny saw blade for this. Luckily the rubber grip that surrounds the pack will be able to hid all the ugliness of the cutting and re-gluing.
The pack uses 4 2/3-subC nicad cells. These are both difficult to find and difficult to insert in the cut open pack. I recommend using 4 AA nicad tabbed cells instead. If you are not likely to use the HP-94 much, the off-state current draw is near zero and the nicad self-discharge will be the dominate current drain. So, you could (and I did) use 4 AAA primary cells in holders inside the battery pack. If you use Energizer lithium cells, they will likely last many years.
There is little you can do with the 94 without writing a program for it. See this thread for more details.
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