Antigravity AG-401 Lithium Battery

(6 customer reviews)


The AG-401 is the smallest battery in the Antigravity Batteries line-up, and the most compact lightweight Lithium motorsport battery available. Ideal for performance applications where you need extreme weight loss, space saving, and extreme power.

  • Small Case format
  • 4.25 x 1.25 x 3.75 inches (LxWxH)
  • 120 Cranking Amps
  • 6 Amp Hours (Pb Eq)/ 2.6Ah (Actual)
  • 1 lb

In stock

SKU: AG-401 Category: Tag:


Small Case Lithium Battery

The ultra lightweight AG-401 battery, at a minuscule 4.25 x 1.25 x 3.75 inches (LxWxH to top of terminals), offers extreme power in the most compact size in Lithium Motorsport batteries. The Antigravity AG401 is best used for Performance applications where extreme weight loss and ultra compact size are desired. It weighs only 1 lb yet it can start inline 4-Cylinder motors up to 600cc for race use, or up to 250cc for everyday street use in scooters. This Lithium motorcycle battery is also a favorite of custom builders who want the smallest battery to tuck out of the way.

From Everyday Riders to Pro Racers & Teams

The Monster Energy Kawasaki USA and Europe SX/MX/MXGP teams, as well as many other top teams use Antigravity Batteries.

Antigravity Battery Users: Monster Energy Kawasaki Team
Monster Energy Kawasaki Team
Antigravity Battery Users: Star Racing Yamaha Team 2019
Star Racing Yamaha Team
Antigravity Battery Users: Monster Energy Kawasaki Europe Team
Monster Energy Kawasaki Europe Team


  • Ultra-Lightweight and High-Power Lithium-Ion Motorsport Battery.
  • Most Compact of Lithium Motorsports Batteries available (great for racers and custom builders).
  • Adhesive-Backed Foam Included for EASY INSTALLATION.
  • Can hold a charge up to a year provided there are no “Parasitic Drains” (accessories that draw power when bike is off (i.e. alarms, ECUs, iPods, GPS, heated grips, etc).
  • Large all-brass terminal design.
  • Can be installed in any orientation.
  • No highly toxic materials like Acids or Lead.
  • No fluids to leak and damage the vehicle.
  • 3-Year Warranty (view our Warranty page for details).

Best Uses

  • Capable of every day use in bikes up to 250cc.
  • Race use for Enduro and MX electric start bikes up to 450cc. (If you have a 250cc 2-stroke you will need to use the Antigravity Battery AG-801)
  • Race and Track Day use in inline 4 cylinder 600cc sport bikes (Honda CBR600 rider should use the Antigravity Battery: AG-801).
  • Custom builds like cafe racers or small bore customs up to 350cc. (Please note if you use older classic bikes from mid 1980s and earlier you should update the charging systems to a modern voltage regulator; damaged voltage regulator can overcharge the battery and damage it.)

Not for use in Passenger Cars or Street use Automobiles.
Not for use in PWC (Personal Watercraft).

Use only Lithium specific Motorsport Chargers to charge this battery! Do not use Lead/Acid Chargers. How to Choose a Charger

Recommended Accessories

Proposition 65 Warning

WARNING: Cancer and Reproductive Harm –

Additional information
Weight 1.5 lbs
Dimensions 5 × 6 × 4 in
Product Weight

1 lb

Product Size

4.25" x 1.25" x 3.75" (mm: 110x32x95)

Cranking Amps


Amp Hours (Pb Eq)


Reviews (6)

6 reviews for Antigravity AG-401 Lithium Battery

  1. Bill

    The customer service is great and these batteries work as advertised or better. They have tons of power to start those big motors and seem to last forever. After a cold winter the bike fires right up with no trickle charging, actually no attention at all for the whole winter!

  2. john cunnjngham

    Bought new 4 cell battery in March, battery failed in June, no big deal, these things take a lot of abuse, but after sending the battery back for warranty, took 2 months to get it back., after several phone calls. (Each person I spoke to I had to start all over they each had to look up every bit of my info)

  3. joe palermo

    Excellent product will recommend to all fellow bikers !!! Thanks ,Antigravity

  4. Tim Moricca

    The managment of Antigravity are excellent. I had an issue with an older battery that was not covered by warranty, and they cut me a deal on a new style battery that is just great. The product is light, powerful, and looks good. The best part are the dimensions and weight.

    What can I say, great product and super people to deal with. 5 stars. Putting on one my stand up racing jet ski next.

  5. Rev Steve king

    Fast service on a excellent product. It exceeded my expectations. Highly recommend for your next battery

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