LeFrog said:What battery do you currently have? The YTZ7S is what everybody recommends. Also heard about the Cyclon and the Odissey batteries as being good choices, but more expensive. The Yuasa costs around 100 bucks.
The YTZ7S is available through http://www.batterystuff.com for a total of $79 including shipping to your door. Batteries equivalent to the YTZ7S are available for less than $55.