“If I replace the internal lead-acid batteries with equivalent LiFePO₄ (Lithium Iron Phosphate) batteries that match the same voltage and capacity, will the UPS operate correctly and safely?”
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Thank you for taking time to provide feedback about our BN1500M2 unit. Unfortunately the using of Non-APC batteries on the UPS is not recommended due to specific battery chemistry of that is made specific to UPS. A 12V LiFePO4 batteries have cutoff voltage of 10V and Max float voltage of 12.8 the charger of the UPS stops at 13.7 volts which is higher and could damage an expensive LiFePO4 battery also you will not be able to use full capacity of battery due to cut off voltage of 12Volts on a VRLA battery. We may be coming up with a UPS that can switch from a VRLA to a Lithium Ion unit but it has not been officially announced yet and may be on design and testing phase. If you are still having issues with finding correct battery for the unit I recommend reaching out to our support team. We offer email and chat services through our support site. You may also contact us directly at 800-800-4272 option 4 or visit https://www.se.com/us/en/work/support/ and look for the chat icon available from 8AM-8PM EST.
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