I had to use a vicegrip because mine was corroded. Use a 3/8 wrench and a phillips screwdriver to disconnect the terminal. It wouldn’t budge until I sprayed some WD-40 on it and even then I had to use a vice grip on one side and the 3/8″ wrench on the other and the threads completely smoothed out when it finally came off: The bolt was corroded so badly that I will have to replace it. This one had a phillips head bolt with a 3/8″ nut on it. I wouldn’t do that outside though because of the gas that is put off by the reaction of the baking soda and acid. Baking soda in water works good to clean it off. If your terminals are corroded like these you’ll want to definitely clean the connectors before putting everything back together. The batteries are in “series” meaning that the negative from one is connected to the positive of the other and the connector to the UPS is connected to the remaining positive and negative giving you 12+12=24 Volts. Pay attention to how they are laid out when you take yours apart. There is a fuse between the negative and positive terminals on the left and then the connector for the UPS is attached to the terminals on the right. This battery had been sitting for a while and was corroded, hopefully you don’t have to deal with that.
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