IT'S A MONSTER MONTH OF SAVINGS! - 20% OFF ALL ACCESSORIES (Click for details)
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20% Off All Accessories!


This offer is valid October 22th, 2017 through October 29nd at 2:00am EST.
  • Applicable to new orders only.
  • No coupon code required. Savings are automatically applied to the purchase price.
  • Discount does not include shipping charges.
  • Excludes used and "Scratch and Dent" Items. Other exclusions may apply.
  • 12 Volt APTX4L (YTX4LB Replacement) Sealed AGM Scooter, ATV, and Dirt Bike Battery
    Kinetik
    Item: B77-8421
    12 Volt APTX4L (YTX4LB Replacement) Sealed AGM Scooter, ATV, and Dirt Bike Battery
    All Images © 2017 Monster Scooter Parts
    $ 18 99
    18.99
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    Ships Tue, Oct 24th!
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    Product Features
  • Our best selling motor scooter battery
  • Will not leak or corrode
  • Sealed maintenance free design
  • 35 Cold Cranking Amps (CCA)
  • Warranty: 1 Year
  • Description
    Size APTX4L 50cc scooter battery for street moped style scooters and electric start ATVs & dirt bikes. This size APTX4L scooter battery is the most commonly used motor scooter battery, used on 50cc street scooters and are sometimes simply referred to as a 50cc scooter battery or 50cc ATV battery. This most common of small scooter batteries can also be found on slightly larger engine size machines with 70cc, 90cc, 110cc, & 125cc engines.

    Please see our Specification tab for detailed size and weight information.

    AGM batteries offer the following advantages over conventional batteries:

  • Sealed maintenance free design means there is no worry about checking water levels.
  • AGM technology will not leak or corrode on paint and/or chrome.
  • They have less internal resistance which offers more CCA amperage than wet batteries.
  • By nature AGM batteries are more heat and vibration resistant than conventional batteries, both which contribute to the majority of failures in scooter, ATV, & dirt bike applications.
  • Slower self discharge rate (longer shelf life) means battery can sit for extended periods of time without constant monitoring.


  • The sealed AGM battery requires very little maintenance during storage. The advanced technology eliminates the need to monitor and maintain water levels. The sealed design means much longer periods between charges when the battery is inactive.

    Equivalent Part Numbers:
  • Yuasa YTX4LB Battery
  • Yuasa YTX4L-BS Battery
  • WestCo 12VX4L-B Battery
  • CTX4LB Battery
  • YT4L-BS Battery
  • GT4L-BS Battery
  • CB4L-B Battery
  • Universal Power Group (UPG) UT4L Battery
  • Universal Power Group (UPG) UT4L-BS Battery
  • Specifications
    Voltage: 12 V
    Amp-Hour: 3 Ah
    Cold Cranking Amps (CCA): 35 CCA
    Length: 4-1/2" (114 mm)
    Width: 2-3/4" (69.1 mm)
    Height: 3-3/8" (85.1 mm)
    Weight: 3.09 lb
    Product Reviews
    5 out of 5 stars based on 1 review:
    from Patrick Snead8/22/17
    The price is unbeatable, I will buy from Monster Scooter Parts again!