I have a problem with one of the four 6v batteries that I just installed earlier this month. I have tested the voltage on all four and 3 of them read 6.4v but the 4th one reads 5.4v. It stays like th...
Take the battery down to an impartial source - most auto/tire places will test battery to determine whether it's good or not. If a 3rd party says it's dead then go back to Sam's for further "discussion".