Yamaha Majesty 400 Battery

2004–2014. The OEM battery case the Majesty 400 takes, the lithium that drops into it, and every model year we have on file. One case across the whole run.

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2014 Yamaha Majesty 400

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OEM battery: YT9B-BSYuasa 2026 OEM guide
Case family: YT7B12V starter case
Fits all years: 2004–2014same case every year on file

The Yamaha Majesty 400 takes the YT9B-BS case. The Antigravity AT7B-BS RE-START is a drop-in for that case: 180 cranking amps, 1.5 lb, a built-in jump start that saves enough charge to get you home.

See the Antigravity AT7B-BS

Fits your bike

180CA

StarterYT7B

Antigravity

Antigravity AT7B-BS 12V Motorcycle Battery 180CA (w/ Re-Start, Thin Case)

3-yr warranty · Ships in 3-5 days

Majesty 400 battery by model year

Model years	OEM battery	Where it comes from	Lithium that fits
2004–2014Your year · 2014	OEM batteryYT9B-BS12V starter case	Where it comes fromYuasa 2026 OEM guideAntigravity fitment list agrees	Lithium that fitsAntigravity AT7B-BS RE-START →

Trim covered: Majesty 400 YP400.

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What the Majesty 400 needs, in plain English

Every Majesty 400 from the first 2004 model through 2014 starts on the YT9B-BS case, a 12-volt starter battery. Yamaha 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 AT7B-BS RE-START: 180 cranking amps, 1.5 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 Yamaha Majesty 400 take?+

The YT9B-BS case, the same one on every Majesty 400 from 2004 to 2014. The Antigravity AT7B-BS RE-START is the lithium drop-in for it.

Will a lithium battery work in a Majesty 400 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.