Rock racing batteries have a really good product. They offer one with 2 positive post, one 12 volt and one 16 volt. A very nice charger too. Had a crate car with new 12 volt XS. Engine seemed to always be in a bind, like it was locking up after 10 to 15 laps turned out to be a bad battery. Went with a Rock batt and charger no further issues. Rock Batteries are made in the USA too!!