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Kawasaki KLX300 Battery

2021–2026. Kawasaki changed the KLX300's battery once 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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Year
Make
Model
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Your ride

2026 Kawasaki KLX300

Not yours?
OEM battery
YTZ7SYuasa 2026 OEM guide
Case family
YTZ712V starter case
Fits all years
2021–2026same case every year on file

The Kawasaki KLX300 takes the YTZ7S case. The Antigravity ATZ-7 RE-START is a drop-in for that case: 150 cranking amps, 1.3 lb, a built-in jump start that saves enough charge to get you home.

See the Antigravity ATZ-7
Fits your bike
150CA
Antigravity ATZ-7 12V Dirt Bike Battery 150CA (w/ Re-Start)StarterYTZ7
Antigravity

Antigravity ATZ-7 12V Dirt Bike Battery 150CA (w/ Re-Start)

12V·150CA·1.3 lb
RE-START
$145
$230Save $85
3-yr warranty · Ships in 3-5 days

KLX300 battery by model year

2021–2022OEM batteryYTZ6V12V starter caseWhere it comes fromYuasa 2026 OEM guideAntigravity fitment list agreesLithium that fitsAntigravity ATZ-7 RE-START →
2023–2026Your year · 2026OEM batteryYTZ7S12V starter caseWhere it comes fromYuasa 2026 OEM guideAntigravity fitment list agreesLithium that fitsAntigravity ATZ-7 RE-START →

Trim covered: KLX300.

Shop all Kawasaki Dirt Bike batteries

Why the year matters on this one

The KLX300 is a dirt bike where the battery changed mid-run: 2021 to 2022 takes the YTZ6V and 2023 to 2026 the YTZ7S. 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 2023 to 2026 that means the Antigravity ATZ-7 RE-START: 150 cranking amps, 1.3 pounds, the same case in lithium. Its RE-START function puts the battery to sleep before a parasitic draw can drain it, then wakes it with one press for a jump start. 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 KLX300 take?+
It depends on the year: 2021 to 2022 takes the YTZ6V and 2023 to 2026 the YTZ7S. For 2023 to 2026 that is the Antigravity ATZ-7 RE-START, the lithium drop-in for the YTZ7S 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 KLX300 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.