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★ Top Pick
AJC Battery Compatible with Yamaha YZF-R3 321CC Motorcycle Battery (2015-2018)
The AJC battery is a direct-fit replacement for the 2015–2018 YZF-R3, matching the stock dimensions and terminal layout so it drops into the tray without modification. It delivers the correct 12V output the 321cc parallel-twin needs for reliable cold starts, and the sealed AGM construction handles vibration well on a sport bike. Caveat: some owners report a shorter-than-expected lifespan if the R3 sits unused for extended periods without a trickle charger.
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