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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[–] Heavybell@lemmy.world 1 points 1 month ago (6 children)

Nice idea :)

I want to get some kind of smart lock myself, but I can't find one that would adequately replace what I have in terms of security. Basically, the combination of an Australian deadbolt (which can only be opened or locked with a key regardless of which side of the door you're on) and a regular latch, allowing the door essentially to be in one of three states: unlocked, locked from the outside, and locked from both sides. Such a product doesn't seem to exist. They can all be opened by hand on the inside. And I feel this would cause my insurance to go up being less secure.

[–] Poem_for_your_sprog@lemmy.world 2 points 1 month ago (4 children)

Why would you want to lock yourself in?

[–] dai@lemmy.world 1 points 1 month ago

Keep the kids from opening up the door and running down the Hume.

[–] Heavybell@lemmy.world 1 points 1 month ago

It's not for me. The deadbolt only gets locked when everyone is out of the house. The idea is to make robbing the place discretely harder. Sure, windows remain a weakness, but if a thief enters through the window and cannot open the door, they have to leave via the window too.

[–] obvs@lemmy.world 1 points 1 month ago (3 children)

If a window is close enough to a deadbolt, a thief could smash the window to reach the inner side of the deadbolt. Having it keyed on both sides would mean they would just be reaching another place to put a key.

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[–] mrgoosmoos@lemmy.ca 1 points 1 month ago* (last edited 1 month ago)

sometimes Mormon missionaries come to my place and I invite them in for tea and a pie and a chat

edit: also, are you the original or just took the name?

that's a name I haven't heard in a long time

[–] psud@aussie.zone 1 points 1 month ago

The normal deadlocks also let you key lock it to unlocked, which I do on laundry day as I'm constantly in and out of the back door and don't want to carry my keys

[–] mrgoosmoos@lemmy.ca 1 points 1 month ago (1 children)

is that not a safety hazard, to have it unlockable from the inside only by key?

[–] Heavybell@lemmy.world 1 points 1 month ago (1 children)

Deadbolt doesn't get locked unless everyone is out of the house.

[–] mrgoosmoos@lemmy.ca 1 points 1 month ago (1 children)

but it can be locked and the key hidden away

[–] Heavybell@lemmy.world 1 points 1 month ago (1 children)

By whom tho? Someone wishing harm to the residents? If they're already inside they could be more direct.

[–] mrgoosmoos@lemmy.ca 1 points 1 month ago (1 children)

..were you not a kid at some point, or been around kids?

kids would absolutely fuck around and lock people in as a joke. sure, not all of them, and teaching them is important, but it is non-zero. codes/regulations exist because of dangerous but very unlikely issues

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

I have a Nuki lock that lasts 8 months on 4 AA rechargeable batteries it also has a door sensor sending info via MQTT over Thread. Your lock probably has to overcome a lot of friction so the motor uses more juice than normal.

[–] Melobol@lemmy.ml 1 points 1 month ago

I would love to see this using disposable vape batteries. That would make it a nice 'circle of life'.

[–] Pulsar@lemmy.world 1 points 1 month ago (3 children)

I bought Xtar rechargeable AA just for the deadbolt cause I got tired of replacing enveloops every few weeks. They last a long time, but when they drop to 1.1v the deadbolt stops working. So, battery level is always 100% until the day the lock doesn't work.

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