The Ultimate AGM Upgrade for American V-Twin Motorcycles

When it comes to starting a large-displacement Harley-Davidson, not all batteries are created equal. The Twin Power GYZ20HL Factory Activated AGM Premium Battery represents the pinnacle of lead-acid technology. Part of the exclusive Premium MAX series, this battery is engineered to provide more “punch” than standard replacement units. With a rating of 320 Cold Cranking Amps (CCA), the GYZ20HL ensures your V-Twin engine fires up reliably, whether you are dealing with a chilly morning start or the high-compression demands of a hot engine restart at the gas pump.

Advanced AGM Technology & Maintenance-Free Design

The “GYZ” designation signifies a higher level of performance through Absorbed Glass Mat (AGM) technology. Unlike traditional flooded batteries, the electrolyte in the Twin Power GYZ20HL is absorbed into specialized glass mat separators, making the unit completely spill-proof and leak-proof. This design also allows for a Factory Activated status—meaning the battery is filled, sealed, and charged at the factory. It arrives ready to install immediately, eliminating the need for messy acid handling or initial charging, though a freshening charge is always recommended for peak longevity.

Engineered for High Accessory Loads

Modern touring bikes are accessory-heavy, often equipped with GPS units, upgraded audio systems, and heated gear. The Twin Power GYZ20HL is designed with a high 20Ah capacity and improved charge recovery capabilities. This means it can support “parasitic loads” and power-hungry add-ons without sacrificing the reserve power needed for your next start. Its superior grid components and enhanced active materials provide a longer cycle life and better deep-discharge recovery compared to standard AGM batteries, making it the ideal choice for long-distance cruisers.

Patent-Pending Conductivity & Vibration Resistance

Vibration is the number one killer of motorcycle batteries, especially on a thumping V-Twin. The GYZ20HL is built with an extreme vibration-resistant case and reinforced internal plates to prevent cell damage on the road. A standout feature is the patent-pending embedded brass nuts within the heavy-duty terminals. Brass is up to 50% more conductive than the stainless steel used in cheaper batteries, ensuring a cleaner electrical path and more efficient power delivery to your starter motor. These flush-mounted terminals also offer a secure, rattle-free connection that resists the loosening effects of engine pulses.

Perfect OEM Fitment and Reliability

Fitment is seamless with the Twin Power GYZ20HL. Designed to replace the OEM 65989-97A battery, its dimensions (6.875″ L x 3.43″ W x 6.125″ H) ensure a direct “drop-in” installation for Softail, Dyna, and Sportster models. Proudly reflecting Twin Power’s commitment to quality, this battery offers a longer shelf life and higher durability than entry-level alternatives. Whether you are restoring a classic or maintaining a late-model Milwaukee-Eight, the GYZ20HL provides the dependable starting power and “Made for Harley” ruggedness you expect.

Note: To maximize the lifespan of your AGM battery, it is recommended to use an AGM-optimized smart tender during long periods of inactivity.

Twin Power GYZ20HL Factory Activated AGM Premium Battery
Features:
AGM (Absorbed Glass Mat) separators with superior grid and component designs
Improved charge recovery capability from a deeply discharged condition
Longer shelf life
Filled, sealed and charged at the factory
Extreme vibration resistance
Heavy-duty, flushed mount terminals
Higher cold cranking amps and includes threaded post
One-year manufacturer’s warranty

Harley Davidson

Dyna Convertible FXDS 1994-2000

Dyna Fat Bob CVO/SE FXDFSE 2009, 2010

Dyna Fat Bob FXDF 2008-2017

Dyna Glide Custom FXDC 1992

Dyna Glide Daytona FXDB-D 1992

Dyna Glide Sturgis FXDB-S 1991

Dyna Low Rider FXDL/I 1993-2017

Dyna Low Rider S FXDLS 2016, 2017

Dyna Street Bob FXDB/I 2006-2017

Dyna Super Glide Custom FXDC/I 2005-2014

Dyna Super Glide CVO/SE FXDSE 2007

Dyna Super Glide CVO/SE FXDSE2 2008

Dyna Super Glide FXD/I 1995-2010

Dyna Super Glide Sport FXDX 1999-2005

Dyna Super Glide Sport Touring FXDXT 2001, 2002, 2003

Dyna Switchback FLD 2012, 2013, 2014, 2015, 2016

Dyna Wide Glide CVO/SE FXDWG2 2001

Dyna Wide Glide CVO/SE FXDWG3 2002

Dyna Wide Glide FXDWG/I 1993-2017

Softail Bad Boy Springer FXSTSB 1995, 1996, 1997

Softail Blackline FXS 2011, 2012, 2013

Softail Breakout 114 FXBRS 2018, 2019, 2020

Softail Breakout 117 FXBR 2023, 2024, 2025, 2026

Softail Breakout CVO/SE FXSBSE 2013

Softail Breakout FXBR 2018, 2019

Softail Breakout FXSB 2013, 2014, 2015, 2016, 2017

Softail Convertible CVO/SE FLSTSE 2010

Softail Convertible CVO/SE FLSTSE2 2011

Softail Convertible CVO/SE FLSTSE3 2012

Softail Cross Bones Springer FLSTSB 2008, 2009, 2010, 2011

Softail Custom FXSTC/I 1991-2010

Softail Deluxe FLDE 2018, 2019, 2020

Softail Deluxe FLSTN/I 2005-2017

Softail Deuce CVO/SE FXSTDSE 2003

Softail Deuce CVO/SE FXSTDSE2 2004

Softail Deuce FXSTD/I 1999-2007

Softail Fat Bob 114 FXFBS 2018-2023

Softail Fat Bob FXFB 2018, 2019

Softail Fat Boy 114 FLFBS 2018-2024

Softail Fat Boy CVO/SE FLSTFSE 2005

Softail Fat Boy CVO/SE FLSTFSE2 2006

Softail Fat Boy FLFB 2018, 2019, 2025, 2026

Softail Fat Boy FLSTF/I 1991-2017

Softail Fat Boy Lo FLSTFB 2010-2016

Softail Fat Boy S FLSTFBS 2016, 2017

Softail FXDR 114 FXDRS 2019, 2020

Softail Heritage Classic 114 FLHCS 2018-2024

Softail Heritage Classic FLHC 2018-2026

Softail Heritage Classic FLSTC/I 1991-2017

Softail Heritage FLST/I 2006

Softail Heritage Springer FLSTS/I 1997-2003

Softail Low Rider FXLR 2018, 2019, 2020

Softail Night Train FXSTB/I 1999-2009

Softail Nostalgia FLSTN/I 1993

Softail Slim FLS 2012-2017

Softail Slim FLSL 2018, 2019, 2020, 2021

Softail Slim S FLSS 2016, 2017

Softail Special FLSTN/I 1994, 1995, 1996

Softail Sport Glide FLSB 2018, 2019, 2020, 2021

Softail Springer Classic FLSTSC/I 2005, 2006, 2007

Softail Springer CVO/SE FXSTSSE 2007

Softail Springer CVO/SE FXSTSSE2 2008

Softail Springer CVO/SE FXSTSSE3 2009

Softail Springer FXSTS/I 1991-2006

Softail Standard FXST 2020, 2021, 2022, 2023, 2024

Softail Standard FXST/I 1999-2012

Softail Street Bob 114 FXBBS 2021, 2022, 2023, 2024

Softail Street Bob FXBB 2018, 2019, 2020, 2025, 2026

Sportster Custom XL1200C 1997-2003

Sportster Custom XL883C 1998-2003

Sportster Hugger XLH883HUG 1997-2003

Sportster Roadster XL883R 2002, 2003

Sportster Sport XL1200S 1997-2003

Sportster XLH1200 1997-2003

Sportster XLH883 1997-2003

Triumph

Rocket III 2003-2011

Rocket III Classic 2004-2011

Rocket III Classic Tourer 2007, 2008, 2009, 2010, 2011

Rocket III Roadster 2011-2018

Rocket III Touring 2009-2017

Tiger Explorer 2012, 2013, 2014, 2015, 2016

Tiger Explorer XC 2012, 2013, 2014, 2015, 2016

Tiger Explorer XCa 2016, 2017

Tiger Explorer XCx 2016, 2017

Tiger Explorer XR 2016, 2017

Tiger Explorer XRt 2016, 2017

Tiger Explorer XRx 2016, 2017

Trophy SE 2013, 2014, 2015, 2016, 2017

Yamaha

XV1900 Star Eluder 2018

XVS1300 Stryker 2011-2017

XVS1300 V Star 1300 Tourer 2013, 2014, 2015, 2016, 2017

XVZ1900 Star Venture 2018, 2020, 2021