Yamaha Warrior 350 Battery

1987–2004. The OEM battery case the Warrior 350 takes, the lithium that drops into it, and every model year we have on file. One case across the whole run.

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2004 Yamaha Warrior 350

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OEM battery: YB12C-AYuasa 2026 OEM guide
Case family: YB12C-A12V starter case
This battery fits: 2004other years take a different case

The Yamaha Warrior 350 takes the YB12C-A case. The Ionic S4 is a drop-in for that case: 500 cranking amps, 3.3 lb.

Fits your machine

Ionic Lithium S4 12V ATV Starter Battery (500CA)

12V·500CA·3.3 lb

$89

$149Save $60

5-yr warranty · Ships in 3-5 days

Warrior 350 battery by model year

Model years	OEM battery	Where it comes from	Lithium that fits
1987–2003	OEM batteryYB12C-A12V starter case	Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees	Lithium that fitsAntigravity ATX12-AH RE-START →Ionic S4 →
2004Your year · 2004	OEM batteryYB12C-A12V starter case	Where it comes fromYuasa 2026 OEM guide	Lithium that fitsIonic S4 →

Trim covered: Warrior 350.

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What the Warrior 350 needs, in plain English

Every Warrior 350 from the first 1987 model through 2004 starts on the YB12C-A case, a 12-volt starter battery. Yamaha ships it with a lead-acid battery that starts to fade after two or three seasons of short rides and off-season storage, and that is usually the day a rider goes looking for something better.

The lithium drop-in is the Ionic S4: 500 cranking amps, 3.3 pounds, the same case in lithium. Charge it with a lithium-compatible charger or maintainer for the off-season and it outlasts the lead-acid battery it replaces by years.

What size battery does a Yamaha Warrior 350 take?+

The YB12C-A case, the same one on every Warrior 350 from 1987 to 2004. The Ionic S4 is the lithium drop-in for it.

Will a lithium battery work in a Warrior 350 without changes?+

Yes, on a machine with a healthy charging system: the lithium battery uses the same case, the same posts and the same cables, and it drops in where the lead-acid battery sat. Check that the stator and regulator hold a steady charge, fill any gap in the tray with the foam spacers most lithium ATV batteries include, and match the terminal layout of the battery you are replacing.

Do I need a different charger for a lithium ATV battery?+

Use a charger or maintainer with a lithium (LiFePO4) mode. A lead-acid trickle charger can push the wrong voltage profile, and a desulfation mode can damage a lithium pack. A lithium-profile maintainer over the off-season keeps it topped without harm, and the battery loses only a few percent of charge a month sitting on its own.