Harley-Davidson Softail Heritage Battery
1986–2026. Harley-Davidson changed the Softail Heritage'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.
2026 Harley-Davidson Softail Heritage
- OEM battery
- YTX20L-BSYuasa 2026 OEM guide
- Case family
- YTX20L12V starter case
- Fits all years
- 2025–2026same case every year on file
The Harley-Davidson Softail Heritage 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
Softail Heritage battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 1986–1990 | OEM batteryYTX20-BS12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
| 1991–2021 | OEM batteryYTX20L-BS12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
| 2025–2026Your year · 2026 | OEM batteryYTX20L-BS12V starter case | Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
6 trims covered: Softail Heritage Classic FLHC, Softail Heritage Classic FLSTC, Softail Heritage Classic FLSTC (ABS), Softail Heritage Classic FLSTC/I, Softail Heritage FLST, Softail Heritage FLST/I.
Shop all Harley-Davidson batteriesWhy the year matters on this one
The Softail Heritage is a motorcycle where the battery changed mid-run: 1986 to 1990 takes the YTX20-BS and 1991 to 2026 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 1991 to 2026 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.