The Antigravity Battery is an extremely versatile high power and lightweight Lithium Motorcycle/Motorsports battery. It has the capability for large weight reduction in the most compact size in lithium batteries in its class. AG-401 This fits our Antigravity 4-Cell Battery Tray. Small Case format 4.375 x 1.37 x 3.75 inches (LxWxH) 120 Cranking Amps 6 Amp Hours (Pb Eq)/ 2.6Ah (Actual) 15.2 oz AG-801 Small Case format 4.375 x 2.37 x 3.75 inches (LxWxH) 240 Cranking Amps 11 Amp Hours (Pb Eq)/ 5.5Ah (Actual) 1.56 lbs AG-1201 This fits our '82-'03 Sportster Hardtail Kit. Small Case format 4.5 x 3.25 x 4.25 inches (LxWxH) 360 Cranking Amps 16 Amp Hours (Pb Eq)/ 8Ah (Actual) 2.25 lbs AG-1601 Small Case format 4.5 x 3.25 x 5.25 inches (LxWxH) 480 Cranking Amps 27 Amp Hours (Pb Eq)/ 8Ah (Actual) 3.18 lbs