Triumph Bonneville T120 Battery
2016–2026. Triumph changed the Bonneville T120's battery twice 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.
2026 Triumph Bonneville T120
- OEM battery
- YTX12-BSYuasa 2026 OEM guide
- Case family
- YTX1212V starter case
- This battery fits
- 2021–2026other years take a different case
The Triumph Bonneville T120 takes the YTX12-BS case. The Antigravity ATX12 RE-START is a drop-in for that case: 360 cranking amps, 3 lb, a built-in jump start that saves enough charge to get you home.
See the Antigravity ATX12
Bonneville T120 battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 2016 | OEM batteryYTX12-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX12 RE-START →Antigravity ATX12-HD RE-START →Ionic S4 → |
| 2017–2020 | OEM batteryATZ1012V starter case | Where it comes fromManufacturer fitment list | Lithium that fitsAntigravity ATZ-10 RE-START →Antigravity ATZ-10-HD RE-START →Antigravity ATX12 RE-START →Antigravity ATX12-HD RE-START →Ionic S4 →Antigravity's list names the ATZ10 for this model; Yuasa's guide names the YTX12-BS case for some trims. Go by the code on your old battery. |
| 2021–2026Your year · 2026 | OEM batteryYTX12-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX12 RE-START →Antigravity ATX12-HD RE-START →Ionic S4 → |
2 trims covered: Bonneville T120, Bonneville T120 Black.
Shop all Triumph batteriesWhy the year matters on this one
The Bonneville T120 is a motorcycle where the battery changed mid-run: 2016 takes the YTX12-BS, 2017 to 2020 the ATZ10 and 2021 to 2026 the YTX12-BS. 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 to 2026 that means the Antigravity ATX12 RE-START: 360 cranking amps, 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.