The Antigravity AG-27R-60-RS is a Group 27R lithium car battery built around 60Ah of LiFePO4 cells, a Re-Start keyfob and a built-in battery management system, in a case that is meant to drop into the factory tray. Group 27 is a case size used by older American cars, some Honda and GM vehicles, performance cars and boats, and 60Ah is aimed at higher electrical loads.
Lithium has a reputation for going dead with no warning. Re-Start is Antigravity's answer: a low-voltage cut-off protects the cells, enough energy stays in reserve to restart the engine, and the keyfob or top button releases it when you need it. Behind that sits a full battery management system covering over-discharge, over-charge, short circuit and thermal protection, plus cell balancing.
The 19.75 lb case weight is a big drop from lead-acid, and Antigravity quotes up to 70 percent less weight for its lithium line. The cells are sealed with no liquid acid, they do not vent hydrogen while charging, they resist vibration, and Antigravity puts expected life at 7 to 9 years depending on use. Cranking is rated at 1800 peak cranking amps (CA), a peak figure rather than a CCA test number. Track Ready Products stocks the Antigravity AG-27R-60-RS, so you can pick up your battery and your other track-day parts in one order.
Pull the negative cable first, then positive, remove the hold-down and the old battery, drop the new one in, and reconnect positive before negative.
Charge it only with a charger that supports LiFePO4. A standard lead-acid or desulfator charger can damage the cells, and Antigravity recommends its SC-4 or SC-10 Super-Chargers.
Match the terminal side to your old battery before you order, and make sure your cable ends fit the threaded terminals.
Lithium gives up some cranking power in deep cold, so keep that in mind for winter starts. Antigravity ships these with an adult signature required at delivery, so plan for someone to be home.
