I've ran 1 North Star g34 up front and 3 G31 North Stars in the rear on a ampere tfe 8.0 at .5 alt was a DC320 voltage dropped to 11.8....swapped out the 3 G31s for a Juicebox 40 ah lithium and the lowest I dropped was 12.5....SO with that being said... the lithium held better voltage,shaved of 200+ lbs from the rear and required less wiring to do so....so i say lithium over agm