Tryin' to help out an older friend has two batteries been unused in his boat for two yrs + ...
After pulling the caps, water is full, but both have a white substance on top of the plates...cannot tell what it is, but I've never seen this before...
...anybody know what this white coating is?...I was gonna hook 'em up to the onboard charger, but now ain't gonna til I find out what this sh!t is...