Ask Electronics

3548 readers

4 users here now

For questions about component-level electronic circuits, tools and equipment.

Rules

1: Be nice.

2: Be on-topic (eg: Electronic, not electrical).

3: No commercial stuff, buying, selling or valuations.

4: Be safe.

founded 2 years ago

MODERATORS

[email protected]

Switching out UPS batteries (lemmy.ml)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

22 comments fedilink hide all child comments

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

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 1 points 1 month ago (1 children)

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

[–] [email protected] 3 points 1 month ago (1 children)

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

[–] [email protected] 1 points 1 month ago (2 children)

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

[–] [email protected] 2 points 1 month ago (1 children)

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

[–] [email protected] 1 points 1 month ago (1 children)

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

[–] [email protected] 2 points 1 month 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 1 month ago (1 children)

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 1 month ago

Yeah for now I will stay with lead batteries thx