I have an 85 amp hour sealed battery, this ran flat on me today. This is the first time this has happened as I charge it every other night, and only run the Varistream on number 2 setting.
This battery is only about 6 months old.
The battery is as I said sealed, but it does have one screw in plug at the top, when you take it out there is a piece of clear plastic about 2 inches long on the end of it.
Apart from maybe using this screw plug for filling the thing when it's new, does it have any other function?