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Yamaha BW350 Battery

1987–1988. The OEM battery case the BW350 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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1988 Yamaha BW350

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OEM battery
YB12B-B2Yuasa 2026 OEM guide
Case family
YB12B-B212V starter case
Fits all years
1987–1988same case every year on file

The Yamaha BW350 takes the YB12B-B2 case. The Ionic S4 is a drop-in for that case: 500 cranking amps, 3.3 lb.

See the Ionic S4
Fits your bike
500CA
Ionic Lithium S4 12V ATV Starter Battery (500CA)Starter
Ionic

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

12V·500CA·3.3 lb
$89
$149Save $60
5-yr warranty · Ships in 3-5 days

BW350 battery by model year

1987–1988Your year · 1988OEM batteryYB12B-B212V starter caseWhere it comes fromYuasa 2026 OEM guideLithium that fitsIonic S4 →

Trim covered: BW350 Big Wheel.

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What the BW350 needs, in plain English

Every BW350 from the first 1987 model through 1988 starts on the YB12B-B2 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 BW350 take?+
The YB12B-B2 case, the same one on every BW350 from 1987 to 1988. The Ionic S4 is the lithium drop-in for it.
Will a lithium battery work in a BW350 without changes?+
Yes, on a bike 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. Bikes older than about 2000 should have their voltage regulator and rectifier checked first, since a failing one overcharges any battery and lithium tolerates it less. Fill any gap in the tray with the foam spacers most lithium dirt bike batteries include.
Do I need a different charger for a lithium dirt bike 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.