For a high-performing battery, choose a YTX20L-BS. This motorcycle battery usually comes with pre-measured acid, sealed for spill proofing. You can also purchase Yuasa YTX20L-BS batteries that do not need refilling of acid, as they recharge instead. You can also opt for a lithium-ion battery that is useful not only in track, off-road, and race bikes, but also for standard bikes. With a lithium-ion battery, you do not have to worry about leaks or spills, and you are even helping the environment by not adding to heavy metal emissions. Search eBay for new and used YTX20L-BS batteries, and look for deals that offer free shipping. Furthermore, purchase from top-rated sellers, who have gained a reputation for providing quality products and excellent customer service.