Triumph Bonneville Speed Twin Battery
2019–2021. Triumph changed the Bonneville Speed Twin'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.
2021 Triumph Bonneville Speed Twin
- OEM battery
- ATZ10Manufacturer fitment list
- Case family
- YTZ1012V starter case
- Fits all years
- 2019–2021same case every year on file
The Triumph Bonneville Speed Twin takes the ATZ10 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
Bonneville Speed Twin battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 2019–2020 | OEM batteryYTX9-BS12V 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 → |
| 2021Your year · 2021 | OEM batteryATZ1012V starter case | Where it comes fromManufacturer fitment list | Lithium that fitsAntigravity ATZ-10 RE-START →Antigravity ATZ-10-HD RE-START → |
Trim covered: Bonneville Speed Twin.
Shop all Triumph batteriesWhy the year matters on this one
The Bonneville Speed Twin is a motorcycle where the battery changed mid-run: 2019 to 2020 takes the YTX9-BS and 2021 the ATZ10. 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 2021 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.