Kawasaki JT900 STS Battery
1997–2005. The OEM battery case the JT900 STS takes, the lithium that drops into it, and every model year we have on file. One case across the whole run.
2005 Kawasaki JT900 STS
- OEM battery
- YTX20L-BSYuasa 2026 OEM guide
- Case family
- YTX20L12V starter case
- Fits all years
- 1997–2005same case every year on file
The Kawasaki JT900 STS takes the YTX20L-BS case. The Antigravity ATX20 RE-START is a drop-in for that case: 680 cranking amps, 4 lb, a built-in jump start that saves enough charge to get you home.
See the Antigravity ATX20
JT900 STS battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 1997–2005Your year · 2005 | OEM batteryYTX20L-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
Trim covered: JT900 STS, STX.
Shop all Kawasaki Jet Ski batteriesWhat the JT900 STS needs, in plain English
Every JT900 STS from the first 1997 model through 2005 starts on the YTX20L-BS 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 ATX20 RE-START: 680 cranking amps, 4 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.