Thank you, I was kind of suspecting it could be something on that order but wasn't sure. I have a watering system connected to the battery so I know the cells have the water level required, but it could still be a dead cell like you said. I will pull the battery out to do those tests. This battery came with the forklift when we purchased it a year ago, but it was a rebuild battery from 2018 so I could see it getting bad.