Antigravity AG-401
Small Case Lithium 12v Powersports Battery
The ultra lightweight AG-401 battery, at a minuscule 4.375 x 1.37 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 less than 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.
AG-401 Features
- Ultra-Lightweight and High-Power Lithium-Ion Motorsport Battery.
- Most Compact of Lithium Motorsports Batteries available (great for racers and custom builders).
- Large all-brass terminal design.
- Can be installed in any orientation.
- 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).
- 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).
AG-401 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.)
- Note: there is no BMS in the SMALL CASE Batteries, only Balance Charging. They are for closed course use only.
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.
Small Case Comparison
Compare Antigravity Small Case models - the smallest, lightest, most Powerful lithium motorsports batteries available. (on mobile, swipe to see all specs)
| Model | Price | Cranking Amps | Amp Hours | Size | Weight |
| AG-1601 | $289.99 | 480 | 22 Ah (PbEq)/11 Ah (Actual) | 4.5" x 3.25" x 5.25" | 3.18 lbs |
| AG-1201 | $219.99 | 360 | 16 Ah (PbEq)/ 8Ah (Actual) | 4.5" x 3.25" x 4.25" | 2.25 lbs |
| AG-801 | $179.99 | 240 | 11 Ah (PbEq)/ 5.5Ah (Actual) | 4.375" x 2.37" x 3.75" | 1.56 lbs |
| AG-401 | $119.99 | 120 | 6 Ah (PbEq)/ 2.6Ah (Actual) | 4.375" x 1.37" x 3.75" | 15.2 oz |
| SC-1 (Race Only) | $119.99 | 150 | 5 Ah (PbEq)/ 2.2Ah (Actual) | 4.375" x 1.37" x 3.75" | 15.2 oz |
Proposition 65 Warning
WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov
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!
gOOD JOB GUYS!
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)
joe palermo –
Excellent product will recommend to all fellow bikers !!! Thanks ,Antigravity
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.
Rev Steve king –
Fast service on a excellent product. It exceeded my expectations. Highly recommend for your next battery