The Antigravity ATX12-RS is a lithium-ion replacement for the YTX12-size battery, with jump-starting built into the battery. It delivers 360 cranking amps at 2.6 pounds and is rated by Antigravity for everyday use in stock bikes up to 1200cc, which covers the Sportster and Street models it is charted for.

The RE-START system monitors state of charge and puts the battery to sleep before it can go completely dead, holding back a reserve of energy. Press the RE-START button and the bike starts one more time.

A four-terminal design accepts left or right hand negative and positive connections.

Features

• 360 cranking amps, up to twice the output of a comparable lead/acid battery
• RE-START technology: built-in jump starting from a protected energy reserve
• Full battery management system with over-discharge, over-charge, and thermal protection plus real-time cell balancing
• 2.6 lbs in the standard YTX12 case
• Quad-terminal design fits left or right hand negative connections
• LiFePO4 chemistry with very low self-discharge

Installation Notes

• 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.
• The RE-START reserve is activated with the button on the battery case, or remotely through the bike's SAE charging pigtail using the Antigravity RE-START Remote.
• Antigravity does not recommend RE-START models for V-twins over 103 cubic inches or high-compression builds because of their higher current draw; the XPS YTX20 and XPS V-12 are the models rated for those applications.
• Check state of charge every 4 to 6 months if the bike carries parasitic drains such as alarms, trackers, or always-on accessories.

Specifications

• Voltage: 12V
• Cranking amps: 360 CA
• Capacity: 12Ah PbEq (6.1Ah actual), 78Wh
• Case: YTX12, 5.9 x 3.38 x 5.19 in (L x W x H)
• Weight: 2.6 lbs
• Chemistry: LiFePO4 with full BMS

Fitment

Direct replacement for the YTX12-series battery position. Charted for the Harley-Davidson Iron 883, Forty-Eight, SuperLow, Seventy-Two, and Street 500/750; see the Heavy Duty ATX12-HD-RS for broader Sportster coverage and more capacity.