Antigravity batteries have very powerful lithium batteries, high cca (amps) but they need a special type of battery tender (lifeo4)

-works with all 12v systems
-over 2x the power of lead/acid
-up to 80% lighter than lead/acid
-better stater performance
-longer life

I just got one for my trex..starts quick.. I should have tried it first on the mog to see if it cranks it up quicker..