51913
4 options from 4 brands — all the same code, so any of them fits what your current 51913 fits. Cheapest in stock first.
What takes a 51913?
We are still loading battery fitment from our suppliers, so we are not going to list bikes for this code yet — guessing a battery that does not fit the tray helps nobody. The reliable check takes ten seconds: if the battery in your bike says 51913 (or any brand's spelling of it — CTX, BTX, PTX, ATX all mean the same code), everything on this page fits. Not sure? Call (949) 770-2277 with your year, make, model and VIN and we will confirm it.
Why the code is all that matters
Motorcycle batteries are sold under a shared code — 51913 here. The code fixes the case size, the terminal layout and the terminal polarity, which is everything that has to be right for a battery to drop into your tray and reach your cables. Brands change the first letter to make it theirs (Yuasa writes Y, Fire Power writes C, BS Battery writes B), but the rest of the code is the part that fits.