Any good 12v 9Ah should do. Same as an X-30. A word of caution. Bought a couple of inexpensive 12v batteries from a battery store back when we ran a leopard. They last maybe a weekend of road racing. Discovered that those types of batteries do well in an emergency exit signs. They don’t hold up the vibration of a race vehicle. We may have been the exception to the rule as others did ok with cheaper batteries. I went to a large kart retailer and bought his best battery. The battery was as good as ever when the engine sold a couple of years later.
Our KA came with a Duracell 12v 9Ah but haven’t had the opportunity to used it yet. Too blinking cold out.
LAD Specialties customer / tony kart / rotax / kt100