I have used lith batteries 2x on motorcycle. Honda Sabre and Indian scout bobber. Dealer talked me into the first one.Great results on those bikes, the sabre 9 yr old in sons bike and he never uses maintainer I bought for it .Always starts.The scout simply wouldn't start in cold weather with factory batt even maintained.So after warranty expired put lith in a ND boom everytime start.Having said that I probably wouldn't use in the f6b cause they start and last so well.