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Kawasaki KX250X Battery

2021–2026. The OEM battery case the KX250X 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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2026 Kawasaki KX250X

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OEM battery
ATZ5-XManufacturer fitment list
Case family
ATZ5-X12V starter case
Fits all years
2021–2026same case every year on file

The Kawasaki KX250X 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
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3-yr warranty · Ships in 3-5 days

KX250X battery by model year

2021–2026Your year · 2026OEM batteryATZ5-X12V starter caseWhere it comes fromManufacturer fitment listLithium that fitsAntigravity ATZ5-X →

Trim covered: KX250X.

Shop all Kawasaki Dirt Bike batteries

What the KX250X needs, in plain English

Every KX250X from the first 2021 model through 2026 starts on the ATZ5-X case, a 12-volt starter battery. Kawasaki 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 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 Kawasaki KX250X take?+
The ATZ5-X case, the same one on every KX250X from 2021 to 2026. The Antigravity ATZ5-X is the lithium drop-in for it.
Will a lithium battery work in a KX250X 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.