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All methods for changing UPS batteries from lead-acid batteries to Lithium iron phosphate (LiFePO4). They are safer, have a longer lifespan, and are inexpensive. 0:00 Condition of lead-acid batteries 4:25 How to prepare LifePo4 batteries 5:18 Distribute power equally to all batteries 15:07 Connect batteries in series to provide voltage close to that of lead-acid batteries 19:31 Duties and wiring of the BMS circuit 28:15 Soldering the BMS circuit wires to the battery terminals 39:04 Duties and connecting the Active Balance circuit 45:08 Assemble the LifePo4 battery into the UPS.