There is a viper specific Optima battery that fits the Viper, if you get the wrong one it will arc against the frame. Many people don't like them, but I've had great luck with mine. The key is not to deep cycle the red top battery, if you don't drive it much, keep a "Battery Tender" brand maintainer on the car. No other brand of battery maintainer works as effectively, and I've tried them all. I use part number 021-0128 and its available at Walmart. It's called a Battery Tender Plus by Deltran. The Optima battery part number is 8078-109 78 Redtop.