The YFZ 450 takes a 12V AGM battery from the YT7B-BS or GT7B-4 family by year, with 6-6.5 Ah and dimensions around 5.75 by 2.55 by 3.65 inches.
Finding the correct YFZ 450 battery requires checking your model year, as the standard replacement is a 12-volt AGM from the YT7B-BS or GT7B-4 family. These deliver 6 to 6.5 amp‑hours and about 85 cold cranking amps, with dimensions of 5.75–5.91 inches long, 2.55–2.56 inches wide, and 3.65–3.74 inches tall. The exact code and size can shift between years and sub-models — a 2006 YFZ 450 and a 2012 YFZ450R may differ slightly in terminal placement or case height. Verifying fitment against your specific year is worth the minute it takes, as the tray is tight enough that a quarter‑inch mismatch can prevent clean installation.
The Standard YFZ 450 Battery Codes
Most YFZ 450s use a YT7B-BS, GT7B-4, or YTZ7S battery — all 12V, sealed AGM, maintenance‑free. The YT7B-BS is a direct replacement across multiple years, with specs of 12V, 6.5 Ah, and dimensions 5.75″ × 2.55″ × 3.65″. The GT7B-4 is the standard factory size, with the YT7B-BS as a fitting alternative sharing the same footprint. For 2009–2021 models, the YT7ZS or MG7ZS-C matches at 12V, 6 Ah with dimensions 113 mm × 69 mm × 105 mm — about 4.45″ × 2.72″ × 4.13″. That taller profile may not fit earlier trays without adjustment. For proven models, see our recommended YFZ 450 battery picks.
Year-Specific Fitment Differences
Yamaha used different battery codes, and the differences matter more than most expect. A 2006 model takes the YT7B-BS at 12V, 6 Ah, 85 CCA with dimensions 5.91″ × 2.56″ × 3.74″. 2007–2008 SE models use the same family. The 2004–2013 range is broadly covered by a GT7B-4 or YT7B-BS at 12V, 6.5 Ah, 85 CCA sized at 5.91″ × 2.56″ × 3.66″. For YFZ450R (2009–2022) and YFZ450X (2010–2011), some listings specify a premium AGM with 130 CCA, aiding cold starts, per Battery Mart’s YFZ 450 battery listings. Always match the battery code to your year and sub-model.
| Model Years | Battery Code | Key Specs |
|---|---|---|
| 2004–2013 | GT7B-4 / YT7B-BS | 12V, 6.5 Ah, 85 CCA, 5.91″ × 2.56″ × 3.66″ |
| 2006 | YT7B-BS | 12V, 6 Ah, 85 CCA, 5.91″ × 2.56″ × 3.74″ |
| 2007–2008 SE | YT7B-BS | 12V, 6–6.5 Ah, 85 CCA |
| 2009–2021 | YT7ZS / MG7ZS-C | 12V, 6 Ah, 113 mm × 69 mm × 105 mm |
| 2009–2022 R / 2010–2011 X | Premium AGM | 12V, 6 Ah, 130 CCA |
AGM or Lithium: Which Battery Is Right for Your YFZ 450?
AGM is the default for YFZ 450 replacements, matching the original spec without charging‑system modifications, and handling vibration without leaking. A standard AGM delivers 6–6.5 Ah with 85–130 CCA. Lithium iron phosphate batteries weigh half as much and offer higher cranking amps. But lithium requires a compatible charger, can lose starting power in freezing temperatures without a low‑temperature cutoff, and costs roughly twice as much as AGM. For most seasonal riders, a quality AGM keeps installation simple and reliable. For racing or weight savings, a lithium option may be worth the premium, but verify your model’s charging system and tray dimensions support it.
FAQs
Can I use a lithium battery in my YFZ 450?
Yes — some models came with lithium batteries from the factory, and aftermarket LiFePO4 replacements are available. They weigh about half as much and deliver higher cranking amps, but need a lithium‑compatible charger and may struggle in freezing temperatures. AGM remains simpler for most riders.
Will a car battery work in a YFZ 450?
No. A standard flooded automotive battery is too tall and heavy for the YFZ 450 tray, and it is not sealed — acid can leak off‑road. The YFZ 450 requires a sealed AGM powersports battery matching its specific dimensions. Stick with the correct YT7B-BS or GT7B-4 code.
How do I find the right battery for my model year?
Look up your year and sub‑model (base, SE, R, or X) in a fitment guide from a trusted seller like Battery Mart or O’Reilly Auto Parts. The battery code on your old battery is the most reliable starting point. Cross‑reference that code with year‑specific listings before ordering.
References & Sources
- Battery Mart. “Yamaha YFZ450 ATV Batteries.” Lists replacement battery codes and specs for YFZ 450 models across multiple years.
- Battery Lookup. “2006 Yamaha YFZ450 Battery.” Provides YT7B-BS replacement specs for the 2006 model.
- O’Reilly Auto Parts. “2019 Yamaha YFZ450R SE Battery Fitment.” Shows fitment details for the YFZ450R SE.