this post was submitted on 01 Feb 2025
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Switching out UPS batteries (lemmy.ml)
submitted 3 weeks ago* (last edited 3 weeks ago) by foremanguy92_@lemmy.ml to c/askelectronics@discuss.tchncs.de
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I have an UPS with two 12v 7ah lead batteries. If I want to change the batteries I would typically go with lead batteries but here's my question, can I use some portable mobile power banks to use it?

Because I have a 20000mah "INUI" lithium power bank that is rated for 12v at 1.5A, is it a good practice to buy several of these (since they are about 20 bucks) disassemble them and use them as ups batteries?

EDIT : clarifications

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[–] foremanguy92_@lemmy.ml 1 points 3 weeks ago (1 children)

I'm not that good in electricity but basically are lithium batteries from power banks would work the same as 12v lead car batteries?

[–] MangoPenguin@lemmy.blahaj.zone 3 points 3 weeks ago (1 children)

No they're different voltages.

[–] foremanguy92_@lemmy.ml 1 points 3 weeks ago (1 children)

On the paper they are 12v, so what makes the real output voltage

[–] MangoPenguin@lemmy.blahaj.zone 3 points 3 weeks ago (1 children)

3s would be 11.1v and 4s is 14.8v, so I'm not sure where you got 12v from.

[–] foremanguy92_@lemmy.ml 1 points 3 weeks ago (2 children)

It is written on the back of the powerbank (sorry but I'm not so good in electrics)

[–] MangoPenguin@lemmy.blahaj.zone 2 points 3 weeks ago (1 children)

Ah gotcha, that's the regulated 12V output with USB PD mode, and not the voltage of the battery inside.

[–] foremanguy92_@lemmy.ml 1 points 3 weeks ago (1 children)

Ohhh okay, sad... Is there a way to get these 12v to use it instead of the stock lead batteries?

[–] MangoPenguin@lemmy.blahaj.zone 2 points 3 weeks ago

Not easily or cheaply, because of the voltage mismatch. Using a buck / boost converter setup tuned specifically for the UPS might work but would be pricey and probably not that reliable.

[–] roofuskit@lemmy.world 2 points 3 weeks ago (1 children)

If you're this confused you shouldn't be trying to change battery types in a device that can power appliances.

[–] foremanguy92_@lemmy.ml 1 points 3 weeks ago

Yeah for now I will stay with lead batteries thx