I purchased twin 65-70 batteries in May 09 for my diesel. The batteries started to go bad and needed charging after sitting 3-4 days to have enough cranking power to start the motor.I went to the store to get replacement batteries after 41 months of service on the 70 month warranty. I knew that the batteries should be prorated. I was informed by the sales person that the battery code 65-70 was superseded to an AGM 65-84 and they won't honor the warranty. ...read more