KTM 640 LC4 Enduro Battery
2001–2005. KTM changed the 640 LC4 Enduro'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.
2005 KTM 640 LC4 Enduro
- OEM battery
- YTZ10SYuasa 2026 OEM guide
- Case family
- YTZ10S12V starter case
- Fits all years
- 2001–2005same case every year
The KTM 640 LC4 Enduro takes the YTZ10S case. The Ionic S4 is a drop-in for that case: 500 cranking amps, 3.3 lb.
See the Ionic S4
StarterYTZ10Antigravity ATZ-10 12V Dirt Bike Battery 360CA (w/ Re-Start)
StarterYTZ10Antigravity ATZ-10-HD 12V Motorcycle Battery 525CA (w/ Re-Start)
640 LC4 Enduro battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 2001–2002 | OEM batteryATZ1012V starter case | Where it comes fromManufacturer fitment list | Lithium that fitsAntigravity ATZ-10 RE-START Antigravity ATZ-10-HD RE-START |
| 2003–2005Your year · 2005 | OEM batteryYTZ10S12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsIonic S4 Antigravity ATZ-10 RE-START Antigravity ATZ-10-HD RE-START |
Trim covered: 640 LC4 Enduro.
Shop all KTM Dirt Bike batteriesWhy the year matters on this one
The 640 LC4 Enduro is a dirt bike where the battery changed mid-run: 2001 to 2002 takes the ATZ10 and 2003 to 2005 the YTZ10S. The plate above names the source for each year, and the table shows each run, so match the year to the case before you order.
For 2003 to 2005 that means the Ionic S4: 500 cranking amps, 3.3 pounds, 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.