I run a ballistic lithium ion battery. About 130$ but it spins my 12:1 motor like it has no spark plug. That's my recommendation. It comes with a one year warranty
Ive always used Yuasa batteries. But im gonna have to favor with Weston on this one, The next battery Im getting will be a Ballistic Evo2, I know they are high but well worth just my opinion. The bikemasters are good batteries also it basically comes down to what you really want to spend.