I have a yellow top battery in my van now for going on 8 years. I have discharged this battery to 11.5 volts and lower at least 100 times. I repeatedly run my fridge (vitro frigo)on high to keep everything semi frozen. play the radio and run the lights,inverter and heater. many,many cycles and this battery doesn't show even a sign of giving up. I'ts lack of amphere hrs is its only downfall. I want to get a bigger battery with more amphere hrs but I'm waiting for this one to die. Might be another 5 years before I see the new battery. If they made one of these with say tripple the amphere hrs I would buy it in a heartbeat, reguardless of price. Just my opinion. Others mileage may very