Harley-Davidson Softail Battery

1984–2024. Harley-Davidson changed the Softail'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.

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2024 Harley-Davidson Softail

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OEM battery: YTX20L-BSYuasa 2026 OEM guide
Case family: YTX20L12V starter case
Fits all years: 1984–2024same case every year on file

The Harley-Davidson Softail 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

Fits your bike

680CA

Starter

Antigravity

Antigravity ATX20 12V Motorcycle Battery 680CA (w/ Re-Start)

3-yr warranty · Free Shipping

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Softail battery by model year

Model years	OEM battery	Where it comes from	Lithium that fits
1984–1990	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 →
1991–2024Your year · 2024	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 →

12 trims covered: CVO Softail Deluxe FLSTNSE, Softail Custom FXSTC, Softail Custom FXSTC/I, Softail Deluxe CVO/SE FLSTNSE, Softail Deluxe FLDE, Softail Deluxe FLSTN, Softail Deluxe FLSTN (ABS), Softail Deluxe FLSTN/I, Softail FLSTSCI, Softail Special FLSTN/I and 2 more.

Shop all Harley-Davidson batteries

Why the year matters on this one

The Softail is a motorcycle where the battery changed mid-run: 1984 to 1990 takes the YTX20-BS and 1991 to 2024 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 2024 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.

What size battery does a Harley-Davidson Softail take?+

It depends on the year: 1984 to 1990 takes the YTX20-BS and 1991 to 2024 the YTX20L-BS. For 1991 to 2024 that is the Antigravity ATX20 RE-START, the lithium drop-in for the YTX20L-BS case. The table above shows every run we have on file, so match your year to the case before you order.

Will a lithium battery work in a Softail without changes?+

Yes, on a bike with a healthy charging system: the lithium battery uses the same case, the same posts and the same cables, and it drops in where the lead-acid battery sat. Bikes older than about 2000 should have their voltage regulator and rectifier checked first, since a failing one overcharges any battery and lithium tolerates it less. Fill any gap in the tray with the foam spacers most lithium motorcycle batteries include.

Do I need a different charger for a lithium motorcycle battery?+

Use a charger or maintainer with a lithium (LiFePO4) mode. A lead-acid trickle charger can push the wrong voltage profile, and a desulfation mode can damage a lithium pack. A lithium-profile maintainer over the off-season keeps it topped without harm, and the battery loses only a few percent of charge a month sitting on its own.