Never get stranded with a dead battery again. The Antigravity ATX20-RS is a high-power, lightweight lithium-ion battery built with groundbreaking RE-START Technology — the world's first battery with built-in jump-starting. Left your ignition on? No problem. The ATX20-RS intelligently monitors its own status, and if it senses over-discharge, it puts itself into sleep mode while saving enough reserve energy to get you started again. Just press the RE-START button on the battery, fire up your bike, and ride away.

The ATX20-RS is a direct replacement for the popular YTX20 series lead/acid battery, making it a drop-in upgrade for many Harley-Davidson Softail, Dyna, and other V-Twin models. At a massive 680 cranking amps and just 3.8 pounds — up to 70% lighter than an equivalent lead/acid battery — you're shedding serious weight while gaining starting power, better handling, and even shorter braking distances.

Features:

• RE-START Technology — World's first battery with built-in jump-starting. Press the button on the battery and go, or pair it with the RE-START Remote accessory to activate it through your SAE charging pigtail without ever removing your seat or side panels.
• Full Battery Management System (BMS) — World's first powersport battery with complete over-discharge protection, over-charge protection, thermal protection, and cell balancing
• 680 Cranking Amps — Up to 2X the cranking amps of similar-sized lead/acid batteries for stronger starts and higher voltage at start-up
• Ultra Lightweight — Just 3.8 lbs, up to 70% lighter than equivalent lead/acid batteries
• Longer Life — Over twice the lifecycle of lead/acid and other lithium batteries thanks to the full BMS
• 4-Terminal Design — Fits right or left hand, negative or positive connections for easy installation in nearly any bike
• Low Self-Discharge — Holds a charge in storage up to 3X longer than lead/acid (check every 4-6 months, or sooner with parasitic drains like alarms, GPS, or heated grips)
• Safest Lithium Chemistry — LiFePO4 technology with no acid or heavy metals like lead, cadmium, or mercury
• Shock & Vibration Resistant — Built tough enough for racing
• Mount in Any Orientation — No liquids to spill or drain

Specifications:

• Cranking Amps: 680 CA
• Amp Hours: 20Ah (PbEq) / 10Ah (Actual) / 128Wh
• Weight: 3.8 lbs
• Case Size: 6.8" x 3.4" x 5.1" (LxWxH) — YTX20 case

Direct OEM Replacement For:

YTX15, YTX15L, YTX15L-BS, YTX20, YTX20-BS, YTX20L, YTX20L-BS, YTX20H, YTX20H-BS, YTX20HL, YTX20HL-BS, YIX20HL, GYZ20H, GYZ20L, GYZ20HL

Best Uses:

• Direct replacement for all OEM lead/acid batteries of the same size
• Excellent for everyday use in bikes up to 2200cc
• Great for large, high-performance V-Twin motors
• Ideal for touring and adventure bikes where extreme power and larger amp hour capacity are needed

Important Notes:

• Large V-Twin Applications: For custom V-Twin builds over 103 cubic inches, or high-compression/modified motors, the RE-START version is not recommended due to the extremely high current draw of these motors. Contact us about the standard YTX20, YTX12-24, YTX12-20, or V-10 models instead.
• Use only a lithium-specific charger with this battery — never a standard lead/acid charger
• Over-charge protection will not protect against a faulty or aging voltage regulator spiking high voltage to the battery
• Not for use with personal watercraft (PWC)
• Not for use in street automotive applications. Contact us about potential "Race Only" automotive use.

Part Numbers:
Manufacturer: AG-ATX20-RS
P/N: antAG-ATX20-RS/58-7007

Fitment:

Verify Your Fitment: Always cross-reference your exact year, make, and model against the manufacturer's battery finder and your owner's manual before ordering to confirm this battery fits your bike.

Milwaukee-Eight Softail Models (2018–Present):

• 2018-Present Harley-Davidson FLFB/FLFBS Fat Boy (107/114/117)
• 2018-Present Harley-Davidson FLHC/FLHCS Heritage Classic (107/114)
• 2018-Present Harley-Davidson FXBR/FXBRS Breakout (114/117)
• 2018-Present Harley-Davidson FXBB/FXBBS Street Bob (107/114)
• 2018-Present Harley-Davidson FXFB/FXFBS Fat Bob (107/114)
• 2018-Present Harley-Davidson FLSB Sport Glide
• 2018-2020 Harley-Davidson FLDE Deluxe 107
• 2018-2021 Harley-Davidson FLSL Softail Slim
• 2018-2020 Harley-Davidson FXLR Low Rider
• 2020-Present Harley-Davidson FXLRS Low Rider S
• 2022-Present Harley-Davidson FXLRST Low Rider ST
• 2020-Present Harley-Davidson FXST Softail Standard
• 2019-2020 Harley-Davidson FXDRS FXDR 114

Twin Cam & Evolution Softail/Dyna Models:

• 1986-1990 Harley-Davidson FLST Heritage Softail
• 2006 Harley-Davidson FLST Heritage Softail
• 1988-1999 Harley-Davidson FLSTC Heritage Softail Classic
• 2000-2006 Harley-Davidson FLSTC Heritage Softail Classic
• 2007-2011 Harley-Davidson FLSTC Heritage Softail Classic
• 2012-2017 Harley-Davidson FLSTC Heritage Softail Classic
• 2001-2006 Harley-Davidson FLSTCI Heritage Softail Classic
• 1990-1999 Harley-Davidson FLSTF Fat Boy
• 2000-2006 Harley-Davidson FLSTF Fat Boy
• 2007-2011 Harley-Davidson FLSTF Fat Boy
• 2012-2017 Harley-Davidson FLSTF Fat Boy
• 2010-2011 Harley-Davidson FLSTFB Fat Boy Lo
• 2012-2017 Harley-Davidson FLSTFB Fat Boy Lo
• 2016-2017 Harley-Davidson FLSTFBS Fat Boy S
• 2001-2006 Harley-Davidson FLSTFI Fat Boy
• 1994-1996 Harley-Davidson FLSTN Heritage Softail Special
• 2008-2011 Harley-Davidson FLSTSB Cross Bones
• 2010 Harley-Davidson FLSTSE CVO Softail Convertible
• 1995-1998 Harley-Davidson FXD Dyna Super Glide
• 1999-2006 Harley-Davidson FXD Dyna Super Glide
• 2007-2010 Harley-Davidson FXD Dyna Super Glide
• 1993-1998 Harley-Davidson FXDL Dyna Low Rider
• 1999-2005 Harley-Davidson FXDL Dyna Low Rider
• 2007-2009 Harley-Davidson FXDL Dyna Low Rider
• 2014-2017 Harley-Davidson FXDL Dyna Low Rider
• 2004-2006 Harley-Davidson FXDLI Dyna Low Rider
• 1993-1998 Harley-Davidson FXDWG Dyna Wide Glide
• 1999-2006 Harley-Davidson FXDWG Dyna Wide Glide
• 2007-2008 Harley-Davidson FXDWG Dyna Wide Glide
• 2010-2011 Harley-Davidson FXDWG Dyna Wide Glide
• 2012-2017 Harley-Davidson FXDWG Dyna Wide Glide
• 2004-2006 Harley-Davidson FXDWGI Dyna Wide Glide
• 1999-2005 Harley-Davidson FXDX Dyna Super Glide Sport
• 2001-2003 Harley-Davidson FXDXT Dyna Super Glide T-Sport
• 1982-1992 Harley-Davidson FXRS Low Glide
• 1983-1992 Harley-Davidson FXRT Sport Glide
• 1984-1999 Harley-Davidson FXST Softail Standard
• 2000-2006 Harley-Davidson FXST Softail Standard
• 2007-2009 Harley-Davidson FXST Softail Standard
• 1999 Harley-Davidson FXSTB Night Train
• 2000-2006 Harley-Davidson FXSTB Night Train
• 2007-2009 Harley-Davidson FXSTB Night Train
• 2001-2006 Harley-Davidson FXSTBI Night Train
• 1986-1999 Harley-Davidson FXSTC Softail Custom
• 2007-2010 Harley-Davidson FXSTC Softail Custom
• 2000-2006 Harley-Davidson FXSTD Softail Deuce
• 2007 Harley-Davidson FXSTD Softail Deuce
• 2001-2006 Harley-Davidson FXSTDI Softail Deuce
• 2003-2004 Harley-Davidson FXSTDSE Screamin Eagle Softail Deuce
• 2001-2006 Harley-Davidson FXSTI Softail Standard
• 1988-1999 Harley-Davidson FXSTS Springer Softail
• 2000-2006 Harley-Davidson FXSTS Springer Softail
• 1995-1997 Harley-Davidson FXSTSB Bad Boy
• 2001-2006 Harley-Davidson FXSTSI Springer Softail
• 2007 Harley-Davidson FXSTSSE Screamin Eagle Softail Springer
• 2009 Harley-Davidson FXSTSSE3 CVO Softail Springer