Re: HP-21 & HP-25 Battery Pack Message #4 Posted by Hal on 12 July 2006, 8:02 p.m., in response to message #1 by Jordi Tarda
Hi Jordi,
If you don't have the shell for the original battery pack assembly, you will need to acquire one, as the battery compartment door is integral with this shell. Watch on E-bay, etc, and they are sometimes available. I just cut the center divider out of my shell, so I can snap rechargable batteries in and out of it (I marked the shell for + and -). It works OK, and I don't have the cells soldered together, as in the original pack. Occasionally I will lose power to the calc, and I have to reposition the battery pack to get it back...I think soldering the cells together would cure this problem, but it's something I can live with. One piece of advise if I may, and my appologies if it is redundant to you, but please don't charge the batteries with the AC adapter while in the calculator...charge them externally. With woodstocks (HP 20 series) you run the risk of damaging the calculator with overvoltage if the battery pack loses contact while the calculator is connected to the AC adapter. Best regards, Hal
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