this post was submitted on 24 Sep 2026

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365

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

submitted 1 month ago* (last edited 1 month ago) by ThePantser@sh.itjust.works to c/3dprinting@lemmy.world

196 comments fedilink hide all child comments

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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[–] cashsky@sh.itjust.works 6 points 1 month ago

The pedantic ludites on lemmy baffle me.

Cool thingy my dude

[–] swagmoney@lemmy.ca 5 points 1 month ago

woah ten kilo milli amp hours!

[–] Dangerhart@lemmy.zip 5 points 1 month ago (1 children)

Does anyone know of rechargeable lithium that can report proportional voltage to emulate what alkaline does? I really want to use rechargeable for everything but not knowing any estimate of when they will die is a huge downside for something like a lock

[–] Landless2029@lemmy.world 4 points 1 month ago* (last edited 1 month ago)

They do NOT.

One key benefit of these AAs batteries offer full voltage until they die. They're stepped down to 1.5v from 5v. But any low voltage indicators are based on dropping voltage and don't work with the tech. They just straight up die.

I just stopped using them in things that are time sensitive like my game controller, but I'm fine with an electronic toothbrush or milk foamer using it since they perform better with full voltage.

[–] modus@lemmy.world 4 points 1 month ago

What about mounting a wireless charging pad to the doorframe to keep it charged? Is that an option?

[–] TropicalDingdong@lemmy.world 4 points 1 month ago* (last edited 1 month ago) (2 children)

Jfc is your door on also a tazer?

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[–] 13igtyme@startrek.website 4 points 1 month ago (2 children)

Why does a dead bolt need batteries? Also if it's just used form some sort of sensor and the door it used a lot, would that just be noise at that point?

[–] ThePantser@sh.itjust.works 5 points 1 month ago (1 children)

Its the sensor is used for the alarm and to run automations based on if the door is left open. Like turning off the AC and sending me a notification if the door is ajar.

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[–] tacosanonymous@lemmy.blahaj.zone 4 points 1 month ago

Usually a keypad entry.

[–] Daft_ish@lemmy.dbzer0.com 4 points 1 month ago

I have this thing and you just turn it. Thats it.

[–] discocactus@lemmy.world 3 points 1 month ago

Ok this is sick. Gives me hope for my garbage $400 "smart" dog door...

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