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Tired of expensive disposable batteries and rechargeable AA suck. So I made a 10k mAh pack for my deadbolt. (thelemmy.club)
submitted 4 days ago* by to c/3dprinting@lemmy.world
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Eneloops would only last about 3 weeks. And disposable last 2 months. This door is used a lot and since it has Zwave and a door open sensor it sends info on every open.

Bonus, since it can handle the lipo AA batteries that put out 1.8v and it gives the motor more oomph I made the battery pack give 7.2v and it never sticks anymore.

This is a garage-door so its not critical access but is used a lot.

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[–] 2 points 4 days ago (6 children)

They do ... 1.2v output is low compared to the 1.5v alkaline .. they lose charge as they sit there doing nothing unless Enerloop which is expensive and still 1.2v - I recently converted the wife's led candles (2 x AA) each to 2 18650 each and now I don't have to charge the things for 15 or so weeks. This guy knows.

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  • [–] 2 points 3 days ago

    1.2v

    The range is actually 1.4-0.9v with drop only at the end of the discharge cycle. Much better than regular AA that drops voltage proportionally to the discharge level. Also more amps than alkaline and no leakage.

    Self discharge is a thing and putting it in clock or led candle is just doing it wrong. Use alkaline for these use cases.

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  • [–] 3 points 3 days ago (2 children)

    The internal resistance is much lower than that of an alkaline, so for some applications, a 1.2V NiMH will match or beat a 1.5V alkaline, but if you really need the extra 0.3V, then they're really pants.

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