The Antigravity "Small Case" lithium ion batteries offer the most power and performance in the most compact size. They can be used as ultra-light battery for race vehicles to save space and weight, or for fitting into Custom and Performance motorcycles which require a small battery that keeps the look and at the same time delivers enough power to turn the starter. Can hold a charge up to a year provided there are no permanent drains, i.e. accessories that draw power when the bike is off, such as alarms, ECUs, GPS, clocks etc. Antigravity Small Case batteries can be installed in any orientation, feature unbreakable brass terminals and come in different power levels.

Capacity is indicated as "xAh Pb Eq" (lead equivalent), because the usable capacity of Li-Ion batteries is typically 3 times higher than an equivalent lead-acid accumulator. In other words, the value indicates which size lead acid battery would be required to deliver the same starting work.

This battery is best used for kickstart only bikes or race track applications where extreme weight loss and ultra compact size are desired. It is also often chosen by custom builders who want the smallest battery to tuck out of the way.