BMW K1600B Battery

2017–2026. The OEM battery case the K1600B takes and the lithium that drops into it, year by year. One case across the whole run.

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2026 BMW K1600B

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OEM battery: YTX20CH-BSOEM parts catalog
Case family: YTX20C12V starter case
Fits all years: 2017–2026same case every year

The BMW K1600B takes the YTX20CH-BS case. The Ionic S4 is a drop-in for that case: 500 cranking amps, 3.3 lb.

See the Ionic S4

Fits your bike

Starter

Ionic

Ionic Lithium S4 12V Motorcycle Battery 500CA (Bluetooth)

Also fits your bike · 2 more

StarterYTX12

Antigravity

Antigravity ATX12 12V Motorcycle Battery 360CA (w/ Re-Start)

Antigravity ATX12-HD 12V Motorcycle Battery 480CA (w/ Re-Start)

K1600B battery by model year

Model years	OEM battery	Where it comes from	Lithium that fits
2017–2026Your year · 2026	OEM batteryYTX20CH-BS12V starter case	Where it comes fromOEM parts catalogYuasa's fitment list agrees	Lithium that fitsIonic S4 Antigravity ATX12 RE-START Antigravity ATX12-HD RE-START

2 trims covered: K1600B, K1600B Option 719 Midnight.

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What the K1600B needs

Every K1600B from the first 2017 model through 2026 starts on the YTX20CH-BS case, a 12-volt starter battery. BMW 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 Ionic S4: 500 cranking amps, 3.3 pounds, the same case in lithium. 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 BMW K1600B take?+

The YTX20CH-BS case, the same one on every K1600B from 2017 to 2026. The Ionic S4 is the lithium drop-in for it.

Will a lithium battery work in a K1600B 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.