The Antigravity AG-801 is the most popular Small Case battery in the line: 240 cranking amps from a package that measures 4.375 by 2.37 by 3.75 inches and weighs 1.56 pounds. It is the battery an entire generation of chopper and bobber builders learned to hide in a battery box, under a seat pan, or inside the frame.

Antigravity rates it for everyday use in bikes up to 550-750cc, race and track use to 1200cc, and custom builds like cafe racers and small-bore customs to 800cc. For kickstart-only Harleys it runs lights and ignition with room to spare.

Features

• 240 cranking amps at 1.56 lbs
• 4.375 x 2.37 x 3.75 in, small enough to hide anywhere on a build
• Rated for street bikes to 550-750cc, race use to 1200cc, customs to 800cc
• Mounts in any orientation; vibration resistant
• Large all-brass terminal design
• LiFePO4 chemistry; holds a charge up to a year without parasitic drains

What's Included

• AG-801 lithium battery
• Adhesive-backed installation foam

Installation Notes

• Small Case batteries use balance charging without an onboard BMS; Antigravity positions them for race, off-road, and custom applications.
• On classic bikes from the mid-1980s and earlier, update the charging system to a modern voltage regulator before running a lithium battery; a failing regulator can overcharge and damage it.
• Charge only with a lithium-compatible (LiFePO4) charger such as the Antigravity SC-2 or SC-4 Super-Charger. Lead/acid chargers, especially those with desulfation or recondition modes, can damage lithium batteries.

Specifications

• Voltage: 12V
• Cranking amps: 240 CA
• Capacity: 9Ah PbEq
• Dimensions: 4.375 x 2.37 x 3.75 in (L x W x H)
• Weight: 1.56 lbs
• Chemistry: LiFePO4 (balance charging, no onboard BMS)

Fitment

Sold as a compact power cell for custom and race builds rather than against a factory fitment chart. Mount in any orientation with the included adhesive foam, in a battery box, or tucked into the frame; confirm dimensions and cranking requirements against your build.