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Tired of expensive disposable batteries and rechargeable AA suck. So I made a 10k mAh pack for my deadbolt.
(sh.itjust.works)
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.
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.