AG-401 Antigravity Battery Small Case
AG-401 Antigravity Battery Small CaseAG-401 Ultra Compact 4-Cell Lithium BatteryAntigravity AG-401 High-Power Lightweight Lithium BatteryAntigravity AG-401 Side Profile

Antigravity AG-401 Battery (4-Cell)

5 out of 5 based on 6 customer ratings
(6 customer reviews)


The AG-401 is the smallest battery in the Antigravity Batteries line-up, and the most compact Lithium motorsport battery available. Ideal for performance applications where you need extreme weight loss, space saving, and extreme power. 120 Cranking Amps, 6 Amp Hours (PB Eq).

In stock

SKU: AG-401 Category: Tags: ,


Small Case Lithium Battery

The AG-401 battery, at a miniscule 4.25″ Length x 1.25″ Depth and 3.75″ Height (to the top of the terminals), offers extreme power in the most compact size in Lithium Motorsport batteries. The AG-401 is best used for Performance applications where extreme weight loss and ultra compact size are desired. Can start inline 4-Cylinder motors up to 600cc for race use, or up to 250cc for everyday street use in scooters. This battery is also a favorite of custom builders who want the smallest battery to tuck out of the way.


  • Adhesive-Backed Foam Included for EASY INSTALLATION.
  • Most Compact of Lithium Motorsports Batteries available.
  • Ultra-Lightweight and High-Power Lithium Nano-Phosphate Motorsport Battery.
  • 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).
  • Built in the USA to high quality standards. Large all-brass unbreakable terminal design.
  • 3-Year Warranty (view our Warranty page for details).
  • Waterproof.

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.)
Additional Information
Weight 1.5 lbs
Dimensions 5 x 6 x 4 in
Product Weight

16 oz (453 g)

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 Battery (4-Cell)

  1. 5 out of 5


    We needed a battery set up and had a small area to work with and this battery did exactly what we were looking for. We created a 24 volt system for our ATV that we race at the ATV MX national motocross races.

  2. 5 out of 5


    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!

  3. 5 out of 5


    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)

  4. 5 out of 5


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

  5. 5 out of 5


    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.

  6. 5 out of 5


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

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