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Add two(2) extra 12volt batteries to your UPS.It super easy!Shopping list:Two 12v batteries.Soldering iron and solder.The correct gauge of wire.Female connectors.Heatshrink.Wire tape.Srewdriver.Cordless drill and drill bits.Crimping tool.PLEASE NOTE: The two batteries inside the UPS must be matched with the amp hours of the two batteries that will be added.Example 2x7ah to 2x7ah.ALL the batteries are 12v.REMEBER TO DISCONNECT UPS FROM WALL SOCKET!!!!