Please read the specifications of the lithium battery and the UPS manual carefully before use. First, find the positive and negative electrodes of the battery input on the UPS machine, corresponding to the positive and negative electrodes of the lithium battery, and connect them with wires. Please note that if the battery input hole of the UPS machine is an Anderson plug, you need to prepare a wire with an Anderson terminal. When the connection is successful, turn on the UPS machine to complete the installation. In addition, our lithium battery support series and parallel connections. When you want to increase the voltage of the battery, you can choose series connection. When you choose to increase the capacity of the lithium battery, you can choose to connect in parallel. Before using our batteries in parallel, please test whether the voltage between the batteries tends to be the same (the voltage difference is within 10mV). Only batteries with the same voltage can be connected in parallel. No matter which connection method you choose, please read the manual carefully. Of course, you can also contact our after-sales team, which is our obligation.