Yamaha YFZ 450 Battery: How to Find the Right Replacement
The short answer
A Yamaha YFZ 450 uses a compact 12-volt powersports battery. The exact battery code, physical size and terminal layout depend on which YFZ 450 you own and its model year. The YFZ450 name covers more than one machine, including the original YFZ450, the later YFZ450R and the YFZ450X. Because of that, no single part number can safely be given for every YFZ 450. Confirm the specification for your specific quad before you order.
Gap in the supplied research: no verified fitment data by model year, market or trim was provided for this article. For that reason, this guide does not assign a battery part number to any particular YFZ 450. Use the checks below to find the correct one.
How to confirm the correct battery for your YFZ 450
Read the label on the battery currently installed. It usually shows a type code, a voltage and a capacity rating. A replacement with the same code is the most direct match, as long as the old battery was the correct one. Check the owner's manual or service manual for your model year. The specifications section lists the battery type the factory specified. Use a parts lookup that asks for the exact model name, year and market. Results for the YFZ450, YFZ450R and YFZ450X can differ, so select the correct variant. Confirm the model and year from the vehicle identification number (VIN) if you bought the quad used or are unsure of its history.
Specifications to match when comparing batteries
Two batteries can share a voltage and still fail to fit or work properly. When comparing a replacement against the factory specification, check each of these points.
Voltage: the battery should be 12 volts. Physical dimensions: length, width and height must fit the battery box and the hold-down strap. Terminal position and polarity: the positive and negative posts must sit on the same sides as the original. If they are reversed, the cables may not reach or may be stretched. Capacity, shown in amp-hours (Ah): a measure of how much charge the battery stores. Match or slightly exceed the specified figure. Cold cranking amps (CCA): how much current the battery can deliver to the starter in cold conditions. A figure at or above the original specification is the usual target. Construction type: many powersports batteries are sealed, maintenance-free designs, often absorbed glass mat (AGM). In an AGM battery the electrolyte is held in fiberglass mats, so it does not need topping up. Some are lithium. Check that the type you choose suits your charging system and charger.
When the answer changes
Several factors can change which battery is right for you. Model year and variant matter most, because the YFZ 450 line was revised over time. Market can also matter, since some model years were sold with different specifications in different regions. Aftermarket changes make a difference too. A relocated battery box or added electrical accessories can affect both the size that fits and the capacity you need. If your quad has been modified, measure the battery space and check the terminal layout rather than relying only on a parts listing.
Before you buy
Confirm three things: the exact model name, the model year and the specification listed for that combination. Then match voltage, dimensions, terminal layout and cranking capacity. If you choose a lithium battery instead of the original type, check that your charger supports lithium batteries.