Ignitions and Electrical› Charging Systems

Mighty Max Battery

Lithium Iron Phosphate Engine Start Battery

$79.99

SKU: YTX9-BSLIFEPO4125

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The Mighty Max Battery YTX9-BSLIFEPO4125 is a Lithium Iron Phosphate (LiFePO4) engine start battery designed for power sport applications. It serves as a direct replacement for Flooded, AGM, and Gel cell lead acid batteries in vehicles like motorcycles, ATVs, and scooters.
Show original supplier description
The Mighty Max Battery YTX9-BSLIFEPO4125 is a high-performance Lithium Iron Phosphate (LiFePO4) battery engineered as a direct replacement for traditional lead-acid batteries in a wide range of power sport applications. This includes motorcycles, ATVs, personal watercraft, scooters, and dirt bikes. With over 2000 deep cycles at an 80% depth of discharge, it ensures long-term reliability. The battery features a voltage of 12.8V, 300 Cold Cranking Amps (CCA), 400 Cranking Amps, and 51.2 Watt-hours. It comes with foam spacers to facilitate fitment into various battery boxes and does not sulfate. Important considerations for use include the necessity of a compatible lithium charger. Users must also ensure that the terminals are screwed in tightly, as loose terminals can lead to heat buildup and battery damage. The battery's case dimensions are 5.94 in x 3.44 in x 4.25 in, and it weighs only 1.00 pounds.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMighty Max Battery
Part NumberYTX9-BSLIFEPO4125
CategoryIgnitions and Electrical

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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