amazing batteries! I have two of these a 650 amp bosch and a 900 amp interstate hooked up in my comp car. these are put inline after a 150 amp breaker with a 300 amp fuse between the sub. I stopped the breaker while I had to clear a limp code in my car and didn't remember to hook it back up! one day later after noticing my speakers where clipping, I inspected my batteries and it was off. but still the batteries held a charge of 12.8 volts! this is feeding a power acoustic eg10000D (4800wrms@ 250 amps) and a arc audio se4100 ( 80wrmsx4 at 70 amps). I had played 4 hours of full power music off them. good batteries for a amazing price!