this post was submitted on 28 May 2026
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Most battery backups use off the shelf batteries with a sticker over the original information. Look up the battery and find a compatible replacement. If you can't find the model number on the battery look at the specs for the battery and cross reference it that way. There are tons of different places that sell the batteries so just start searching.
Also most LFP batteries that match the original leaf acid batteries in size and voltage will not be able to output enough power unless the loading is light. To handle a full load on something similar to a 1500 va ups you need about 80 amps of available power most lfp batteries you get that will fit in a ups are rated at 1c so a 10ah battery can only supply 10 amps of power. That will require a custom battery build that will also need a bms and likely require a modification to the ups to be used and likely will not fit inside the case.