Battery in my 18 300 is weak and won?t take a charger off the trickle charger. I?ve been off work and I?m short on funds right now. Can anybody say anything good about the tusk lithium ion batteries? If not I?ll wait a few weeks and buy a antigravity. I know the 8 cell fits my bike. Do the new karma crossover to our bikes for the sake of ordering off Rocky Mountain? They don?t have gasgas in their search.