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Yamaha YZ250FX Battery

2015–2027. Yamaha changed the YZ250FX's battery twice across the run. Pick your year and we show the case that year takes and the lithium that fits it. Change any box in the strip to look up another bike.

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2027 Yamaha YZ250FX

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OEM battery
ATZ5-XManufacturer fitment list
Case family
ATZ5-X12V starter case
This battery fits
2020–2027other years take a different case

The Yamaha YZ250FX takes the ATZ5-X case. The Antigravity ATZ5-X is a drop-in for that case: 170 cranking amps, 1 lb.

See the Antigravity ATZ5-X
Fits your bike
170CA
Antigravity ATZ5-X 12V Dirt Bike Battery 170CAStarter
Antigravity

Antigravity ATZ5-X 12V Dirt Bike Battery 170CA

12V·170CA·1 lb
$120
$160Save $40
3-yr warranty · Ships in 3-5 days

YZ250FX battery by model year

2015–2018OEM batteryYTX5L-BS12V starter caseWhere it comes fromYuasa 2026 OEM guideAntigravity fitment list agreesLithium that fitsAntigravity ATZ-7 RE-START →
2019OEM batteryATZ712V starter caseWhere it comes fromManufacturer fitment listLithium that fitsAntigravity ATZ-7 RE-START →
2020–2027Your year · 2027OEM batteryATZ5-X12V starter caseWhere it comes fromManufacturer fitment listLithium that fitsAntigravity ATZ5-X →

Trim covered: YZ250FX.

Shop all Yamaha Dirt Bike batteries

Why the year matters on this one

The YZ250FX is a dirt bike where the battery changed mid-run: 2015 to 2018 takes the YTX5L-BS, 2019 the ATZ7 and 2020 to 2027 the ATZ5-X. The plate above names the source for each year, and the table shows every run we have on file, so match the year to the case before you order.

For 2020 to 2027 that means the Antigravity ATZ5-X: 170 cranking amps, 1 pound, 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 YZ250FX take?+
It depends on the year: 2015 to 2018 takes the YTX5L-BS, 2019 the ATZ7 and 2020 to 2027 the ATZ5-X. For 2020 to 2027 that is the Antigravity ATZ5-X, the lithium drop-in for the ATZ5-X case. The table above shows every run we have on file, so match your year to the case before you order.
Will a lithium battery work in a YZ250FX 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.