I recently became the new owner of this set of AGM batteries. 2 volt cells 24 volt total. Reason they were changed out is because 2 have cracks in the plastic housing, I think you can see in the bottom row. But none have leaked.First question,How would be a good way to fix the cracks? Next question, I used a digital meter to check each cell,they all read 2.14 volts... except one which reads 2.04.How do I get it up to the rest? When I picked them up I was told they were at 70 percent capatance? Then the guy added he didnt believe in that method of testing.So ... without taking hydrometer readings on these how do you test them? How do I add fluid to that one if need be? And do these make good batteries for RE?