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Adapting cell battery to HP 41
08-07-2020, 07:26 PM
Post: #33
Craig Bladow Offline
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RE: Adapting cell battery to HP 41
(08-04-2020 10:56 AM)Hans-Peter Wrote:  
Quote:Turns out that LiFePO4 cylindrical cells (3.2 volts each)

Be careful with two LiFePo cells. These have 3.6V per cell at full charge. That would be 7.2V and probably too high to survive.
I have connected two LiFePo4 cells of Soshine AAA size in parallel and added a 5V step-up converter. These have only 2x280mAh but they are suitable for lower temperatures outside.

Thanks for the cautionary note. I have various dc-dc converters on hand so have ordered two 14500 LiFePO4 batteries with a charger.
Try CC41!
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Messages In This Thread
RE: Adapting cell battery to HP 41 - cruff - 02-26-2019, 12:45 PM
RE: Adapting cell battery to HP 41 - Craig Bladow - 08-07-2020 07:26 PM



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