Antigravity AG-401 lithium battery, one of the smallest motorsport batteries made. It measures 4.375" x 1.37" x 3.75" and weighs 15.2 oz, with 120 cranking amps and 6Ah (Pb equivalent; 2.35Ah actual, 30.08Wh).
NOTE: Lithium batteries can only be shipped GROUND, no air freight.
