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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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[–] Rivalarrival@lemmy.today 1 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

The problem will be that the UPS has a charge controller built in, and that charge controller also tests the health of the batteries. It expects battery voltages to rise at specific rates as they charge, and current to match specific patterns. If the charge controller does not see the specific patterns it expects, it will report that the battery is failing.

Charging profiles for Li-ion chemistries are completely different than for lead acid, and the output of the power bank is probably regulated with a boost/buck circuit, which would really confuse the charge controller.

Trying to use 12v power banks to replace UPS batteries is just not a good idea.

[–] foremanguy92_@lemmy.ml 1 points 2 weeks ago

Okay thank you