I've had superior service from Optima red top batteries. I currently have 7 in use in my stuff including 2 in my racecar. I have 2 that are 16 yr old Blems that are still going strong. I've only had 1 red top go bad in the last 16 years. My recently acquired Optima charger says it can't be charged. That's what I'll continue to buy until they start causing me trouble.