Harley-Davidson XL Battery
1979–1984. The OEM battery case the XL takes, the lithium that drops into it, and every model year we have on file. One case across the whole run.
1984 Harley-Davidson XL
- OEM battery
- YTX20-BSYuasa 2026 OEM guide
- Case family
- YTX2012V starter case
- Fits all years
- 1979–1984same case every year on file
The Harley-Davidson XL takes the YTX20-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
XL battery by model year
| Model years | OEM battery | Where it comes from | Lithium that fits |
|---|---|---|---|
| 1979–1984Your year · 1984 | OEM batteryYTX20-BS12V starter case | Where it comes fromYuasa 2026 OEM guide | Lithium that fitsAntigravity ATX20 RE-START →Antigravity ATX20-HD →Ionic S6 → |
Trim covered: XL.
Shop all Harley-Davidson batteriesWhat the XL needs, in plain English
Every XL from the first 1979 model through 1984 starts on the YTX20-BS case, a 12-volt starter battery. Harley-Davidson ships it with a lead-acid battery that starts to fade after two or three seasons of short rides and off-season storage, and that is usually the day a rider goes looking for something better.
The lithium drop-in is 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.