talked to optima today, they said if volts ever get below 10.5 alternator won't charge up correctly. they said to hook a good battery to red top with jumper cables and then charge, 2 amp trickle charge will take 28 hours to fully charge battery. sound like horse sh** to me. found a buddy to get it warrantied and swap out for yellow top. optima also told me I had the wrong battery for my application because I have a winch I need a yellow top, red tops are designed for starting only, when they even do that. have a new yellow top sometime next week, planning on making the meeting and greet.