Antigravity ATX20-HD 12V Motorcycle Battery 780CA (30Ah Heavy Duty)

Antigravity ATX20-HD 12V Motorcycle Battery 780CA: The Most Capacity You Can Bolt Into a YTX20 Tray

The ATX20-HD is Antigravity's heavy-duty take on the big-twin case: a full 15Ah lithium pack (30Ah lead-acid equivalent) and 780 cranking amps in the same YTX20 footprint, at 5.18 lbs. That is roughly twice the capacity of other lithium batteries in this size, and it is the battery Antigravity points you to for big-inch and high-compression V-twins, where the RE-START version is not recommended.

It is also the answer for touring bikes that carry a lot of electronics. Heated gear, audio, auxiliary lights and a phone on the bars all draw from the battery at idle; the HD has the reserve to feed them and still crank. There is no RE-START reserve on the HD. Instead it carries a lighted voltage indicator on top, so one press tells you where the battery stands.

Why the ATX20-HD

• 780 cranking amps for 107, 114 and 117 cubic-inch motors and modified builds
• 30Ah lead-acid equivalent (15Ah lithium, 192Wh): the most capacity in a YTX20 case from any brand
• 5.18 lbs replaces a lead-acid brick that weighs close to 14
• Replaces YTX20, YTX20L-BS, YTX20H-BS, YTX20HL-BS, YTX15L-BS, YIX20HL and the GYZ20 family (15 OEM sizes)
• Push-button voltage indicator; 4-terminal design fits either terminal layout
• Full BMS: over-charge, over-discharge, thermal protection, cell balancing

Antigravity Heavy Duty RE-START Battery Video Review

ATX20-HD Heavy Duty Specs for Nerds

Fits Harley Softail, Dyna and V-Rod, Indian Chieftain and Springfield, Triumph Rocket III and other YTX20-case bikes. If you run a stock motor and want the built-in jump start, the ATX20 RE-START is the pick; the HD is for capacity and cranking headroom. Check your OEM code against the list above, and if you are not sure, we will confirm fitment before you order.

Backed by Antigravity's 3-year powersports warranty. Questions about fit or rigging? A real USA battery tech picks up at 1-800-LBZ-POWR, Mon-Fri 9a-6p EST.