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If you are going to use lithium batteries for UPS purposes, you should look into lifepo batteries. Much safer for that purpose

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What makes them safer? Can you explain please?

Basically, they are much less likely to vent violently.

https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery...

They are in no particular order more resistant to under and overvolting, much more cycle resistant, much more resistant to storage under high charge level, much harder to get to explode etc. For UPS purposes they are the correct choice all around-

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