Happy holidays to everyone. I have a 2007 Big Dog Bulldog. I am tired of replacing batteries that do not put out enough CCA's after about 2 years. I know the minimum CCA recommended for the bike are 320. My question is this. Does anyone have experience with lithium batteries? I hear that they last an incredibly long time with and without a trickle charger. Are they compatible with Big Dog bikes? Any info would be most appreciated. Thank you.