KTM 640 Duke Battery
1999–2007. KTM changed the 640 Duke'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.
2007 KTM 640 Duke
- OEM battery
- YTZ10SYuasa 2026 OEM guide
- Case family
- YTZ1012V starter case
- Fits all years
- 1999–2007same case every year on file
The KTM 640 Duke takes the YTZ10S case. The Antigravity ATZ-10 RE-START is a drop-in for that case: 360 cranking amps, 2.6 lb, a built-in jump start that saves enough charge to get you home.
See the Antigravity ATZ-10
640 Duke battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 1999–2002 | OEM batteryYTX9-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATZ-10 RE-START →Antigravity ATZ-10-HD RE-START →Ionic S4 → |
| 2003–2007Your year · 2007 | OEM batteryYTZ10S12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsAntigravity ATZ-10 RE-START →Antigravity ATZ-10-HD RE-START →Ionic S4 → |
2 trims covered: 640 Duke, 640 Duke II.
Shop all KTM batteriesWhy the year matters on this one
The 640 Duke is a motorcycle where the battery changed mid-run: 1999 to 2002 takes the YTX9-BS and 2003 to 2007 the YTZ10S. 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 2003 to 2007 that means the Antigravity ATZ-10 RE-START: 360 cranking amps, 2.6 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.