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How to connect 12 V external batteries with BR1000GUXI ?

Adhere to all national and local electrical codes.
Do not connect the positive and negative terminals on a single battery. Doing so
can cause the terminals to short and may cause a fire hazard.
Connect no more than two external 12 V batteries in series. The batteries must be
of the same Ah capacity

Please follow below steps:
1. Remove the safety covers on the battery terminals.
2. Use the short jumper cable to connect the negative terminal on battery 1 to the
positive terminal on battery 2.
3. Locate the color coded cable with the 3 pin cable assembly.
Connect the red cable to the positive terminal on battery 1.
Connect the black cable to the negative terminal on battery 2.
Connect the 3 pin connector to the external battery receptacle on the rear panel
of the UPS.
4. Replace the safety covers on the battery terminals