submitted 4 months ago* (last edited 4 months ago) by [email protected] to c/[email protected]

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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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[-] [email protected] 1 points 4 months ago

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

[-] [email protected] 3 points 4 months ago

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

[-] [email protected] 1 points 4 months ago

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

[-] [email protected] 2 points 4 months ago

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

[-] [email protected] 1 points 4 months ago

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

[-] [email protected] 2 points 4 months 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.

[-] [email protected] 2 points 4 months ago

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

[-] [email protected] 1 points 4 months ago

Yeah for now I will stay with lead batteries thx

this post was submitted on 01 Feb 2025

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