Big Juice
We were contemplating using a small AGM (Absorbent Glass Matt) battery in our Saab project, like the Powermaster which is very tough and wouldn’t be damaged by vibration and abuse but decided that a rally project needed at least as much power and reserve as it had when stock, if not more. We went with a Deka Intimidator, a full-size AGM unit. To keep it from getting baked by the header, we wrapped it in DEI’s battery wrap.
The battery is held down with 3/8-inch rod and thick plates on the top and bottom.