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With a maintenance type battery, you can easily check the fluid level in each battery cell and top up as required. It is a different matter with a maintenance free battery but the fluid level in each battery cell will eventually go down. When this happens, the state of charge indicator will go from green to red. The attached document shows how to restore the fluid level in the battery and potentially restore the state of charge indicator back to the green. This has worked for me in restoring 2 Century Maintenance Free Batteries, one back in 2018 and one in July 2020. How to e