I use cheap ones. I never had a battery go dead. I always end up with broken terminals or cracked casings. I had a brand new $70 interstate battery that was installed a week before i bought my warrior. 2 months later and the terminal broke off, so the battery is useless. I just have one of the MotoPower batts from rockymountain on it now, and that seems to be working great, and it's been on there for a year and a half. But if you're looking for the best of the best, i'd say YUASA