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Home / Lighting / Driving & light bars

Century EverRide GYZ20HL Heavy Duty motorcycle battery — black AGM VRLA case with Terminal Type N threaded studsThree-view line drawing of a battery terminal, front, side and top, showing a round post in a rectangular body, labelled Terminal Type – NPlan outline of a six-cell battery case with the negative marked at the left end and the positive at the right – Century battery

Century

GYZ20HL Motorcycle Battery — 320CCA 18Ah AGM

151114

12V 18Ah Heavy Duty AGM motorcycle battery with 320 cold-cranking amps and Terminal Type N threaded studs. Fits Harley Touring, BMW R-series tourers, Victory touring builds and heavy V-twin cruisers that call for the GYZ20HL case.

$215.00

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Fits large-capacity touring motorcycles taking the GYZ20HL case with Type N threaded studs.

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The Century EverRide GYZ20HL is a Heavy Duty 12V 18Ah AGM motorcycle battery that cranks accessory-laden touring and V-twin bikes at 320 cold-cranking amps. It fits large-capacity Harley-Davidson FLHT, FLHX and FLHR Touring from the mid-1990s, BMW R-series tourers running the 18Ah case with threaded terminals, Victory touring builds and heavy-displacement cruisers that use the GYZ20HL / YIX20HL case with Terminal Type N studs.

The case measures 176 by 89 by 154mm and weighs 6.55kg. Cast radial plates widen the active-material surface, pulling an extra 70 amps of cranking out of the same footprint as the GYZ20L. Advanced AGM separators hold the electrolyte between glass mats so there is no spill and the sealed VRLA case mounts on any angle. Terminal Type N uses threaded M6 studs for ring-terminal cable lugs, with the reversed-polarity layout (negative on the right end).

Ships factory activated. Install straight out of the box, torque the ring-terminal nuts evenly to the stud rating and keep the vent clear. If the bike has been sitting, top up on an AGM-profile charger first (Century's CC6121.2 is the matched unit) before fitting.

  • Heavy Duty AGM — built for accessory-laden tourers
  • 320 CCA — cranks heavy V-twins in the cold
  • Factory activated — install straight out of the box
  • Cast radial plates — wider surface for better cranking
  • VRLA sealed — mounts on any angle, no spill
  • Terminal Type N — threaded M6 studs for ring terminals

Electrical

Voltage: 12V

CCA: 320A

Capacity: 18Ah

Chemistry & Construction

Technology: Heavy Duty AGM VRLA

Grid: Cast radial plates

Activation: Factory activated

Physical

Dimensions: 176 × 89 × 154mm

Weight: 6.55kg

Terminal: Type N threaded stud

Length176mm
Width89mm
Height154mm
Weight6.55kg

Ships factory activated — install straight out of the box. VRLA sealed construction mounts on any angle. Terminal Type N uses threaded M6 studs, torque the ring-terminal nuts evenly to the stud rating.

Polarity is reversed from the GYZ20L — negative is on the right end, positive on the left. Keep the vent clear. If the bike has been sitting, top up on an AGM-profile charger before fitting. Century's CC6121.2 is the matched unit.

Fits large-capacity touring motorcycles taking the GYZ20HL case with Type N threaded studs.
Harley-Davidson FLHX, FLHR, FLHT Touring (model-year check)
BMW R-series tourers running the 18Ah case with threaded studs
Victory touring and cruiser builds
Heavy-displacement Yamaha, Kawasaki and Suzuki tourers rated for 320CCA
Bikes requiring Terminal Type A (clamp posts) — use GYZ20L instead
Lithium-only bikes (needs AGM-rated regulator)

Q: What does AGM actually mean?
Absorbed Glass Mat. Fibre-glass mats hold the electrolyte between the plates so nothing sloshes and nothing spills. Sealed, vibration-tolerant, mounts on any angle.

Q: What does CCA actually mean?
Cold Cranking Amps — the current the battery delivers for 30 seconds at -18°C while holding a usable voltage. Higher CCA means the starter spins harder when it's cold. 320A clears heavy V-twins without lugging.

Q: What does Ah actually mean?
Amp-hours — the capacity between full charge and flat. 18Ah covers heavy accessory loads like heated grips, extra lights and a touring stereo without the starter running flat the next morning.

Q: What's the difference between GYZ20HL and GYZ20L?
Terminal type and polarity. GYZ20HL uses Terminal Type N (threaded M6 studs) with negative on the right; GYZ20L uses Terminal Type A (clamp posts) with negative on the left. Both are 18Ah factory-activated Heavy Duty AGM, but GYZ20HL cranks 70A harder (320 vs 250). Match the terminal type and polarity to the bike's existing battery.

Q: What's the difference between GYZ20HL and GYZ20H?
Polarity. Both are 320CCA/18Ah with Terminal Type N studs. GYZ20HL has reversed polarity (negative right); GYZ20H has standard polarity (negative left). Match whichever your bike's existing battery had.

Q: Does it ship ready to install?
Yes. Factory activated — no acid pack, no filling, no first-charge wait.

Q: Can I mount it sideways?
Yes. VRLA sealed, no spill — mounts on any angle. Keep the vent clear and the battery clamped down tight.

Q: Which bikes take a GYZ20HL?
Harley-Davidson FLHX, FLHR and FLHT Touring builds that use threaded-stud terminals, BMW R-series tourers running the 18Ah stud case, Victory touring and cruiser builds, plus heavy-displacement Yamaha, Kawasaki and Suzuki tourers rated for 320CCA. Match the terminal type (N / threaded studs) to the bike's existing battery.

Q: How long will it last?
AGM motorcycle batteries typically run 3-5 years. A tender over winter and a monthly top-up charge add years — short rides and long storage shorten life fastest.

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