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Switching out UPS batteries (lemmy.ml)

submitted 3 months ago* (last edited 3 months 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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[–] ChaoticNeutralCzech@feddit.org 4 points 3 months ago (1 children)

You need a balancing BMS anyway and the UPS will not be able to charge it to what it thinks is 100% (about 15 V at trickle current) unless you trick it with a resistor (which wastes power of course).

[–] MangoPenguin@lemmy.blahaj.zone 4 points 3 months ago (1 children)

Yeah you need a UPS that's OK with the BMS charge FETs opening when the battery is full.

[–] ChaoticNeutralCzech@feddit.org 1 points 3 months ago* (last edited 3 months ago) (1 children)

When there is no trickle current the UPS will beep because it will detect battery removal.

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

Some are ok with it, on a thread I saw on reddit awhile ago about LiFePo4, people had reported a few models that worked fine with the upgrade.