Triumph Thunderbird Battery
2002–2017. Triumph changed the Thunderbird'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.
2017 Triumph Thunderbird
- OEM battery
- YTX20L-BSYuasa 2026 OEM guide
- Case family
- YTX20L12V starter case
- This battery fits
- 2009–2017other years take a different case
The Triumph Thunderbird 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
Thunderbird battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 2002–2003 | OEM batteryYTX14AHL-BS12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsAntigravity ATX12-AH RE-START → |
| 2009–2017Your year · 2017 | OEM batteryYTX20L-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
4 trims covered: Thunderbird, Thunderbird ABS, Thunderbird LT, Thunderbird SE.
Shop all Triumph batteriesWhy the year matters on this one
The Thunderbird is a motorcycle where the battery changed mid-run: 2002 to 2003 takes the YTX14AHL-BS and 2009 to 2017 the YTX20L-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 2009 to 2017 that means 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.