HP/Lommeregnere
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Among others, we have
- HP35
- HP97
as well as
-
HP 21
-
HP 41C
-
HP 45
HP 25 battery pack reconstruction
We have reconstructed the battery pack of our HP 25:
You need a knife and a couple of rechargeable batteries. The 1.2 Volt NiMH batteries that we used worked fine. There are lots of important and additional details on The Museum of HP Calculators. | |
There are several options, we choose to cut through the plastic strip that separate the batteries and slide out the original batteries. (These old batteries worked for a while, actually, but eventually gave up.) | |
Just to remind us: It is important to use the correct polarity when inserting the new batteries into the battery pack. | |
The old battery pack with new batteries inserted. | |
And we are flying again. | |
The same battery pack works for our HP 21. |