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Antigravity Battery AG401

Our Price:  £132.00(Inc. 20% VAT)(£110.00 Exc. VAT)

Model:  AG401



In stock, immediate despatch

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  (10 Reviews)

(Please note if you use older bikes from the mid 1990's and earlier you must update the charging systems to a modern voltage regulator. Damaged voltage regulators can over charge and damage lithium batteries)

Product Description

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

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 Batteries AG801)
  • Race and Track Day use in inline 4 cylinder 600cc sport bikes- (Honda CBR600 rider should use the Antigravity Batteries AG801)
  • 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 sytems to a modern voltage regulator, damaged voltage regulator can overcharge the battery and damage it)

Please note

You MUST only charge our lithium batteries with a lithium specific battery charger, (such as the Optimate battery chargers offered on this website) the use of any other type of battery charger is likely to damage the battery and invalidate the guarantee. 

Average Rating (10 Reviews):  
Write a Review and share your opinions!

Amazing 4cell
Monday, 16 April 2018  | 

The battery is so small and light compared to the old lead battery. There are so many places it can be fitted to the bike (brat project).

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Antigravity Battery AG401
Thursday, 15 February 2018  | 

Fantastic bit of kit, tiny and perfect for custom builds.

AG UK are great to deal with, really helpful and fast delivery, will certainly be buying form them again

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1 of 1 people found this review helpful.

Compact power
Monday, 5 February 2018  | 

This type of battery is a must for anyone building a special and looking to hide the electrics

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This review has not been appraised.

Perfect cafe racer battery
Monday, 24 July 2017  | 

Very good quality product, super light 430grams and hassle free delivery. Also bought the mount for this battery - A little pricey but well worth it as looks great and holds the battery secure.

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Brilliant little battery
Thursday, 18 May 2017  | 

Small and handy perfect for our application. The looks are very convincing and so far also the performance.

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This review has not been appraised.

Not destroyed it yet
Wednesday, 10 August 2016  | 

so far so good,,love it, small ,light helpful prompt service ill let you know how it goes,as the review title suggests everything gets hammered here desmo engineering

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Small case 4 cell
Tuesday, 5 April 2016  | 

I recently purchased a small case 4 cell lithium battery for my custom Honda NX250 and am quite pleased with the performance so far. As advertised it is small, light and packs quite a punch. Will certanly recomend and keep in mind for future purchases.

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4 cell small case
Tuesday, 22 September 2015  | 

I've not used it yet, as its for a project bike, but the service was first class and the quality looks great. Thanks

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This review has not been appraised.

great product but sort out postage options
Wednesday, 9 September 2015  | 

The battery is tiny and lightweight exactly as specified but it would have been nice not to have paid 10 for next day delivery (cheapest option!).

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Because of the nature & value of our products we have chosen to use a tried and tested courier service, this is for safety, reliability and to ensure you get your products in a timely manner. Other delivery services have failed to meet our requirements.

Monday, 6 July 2015  | 

Really pleased with this awesome product. Could not believe the weight & size. Got this for my custom Honda FMX 650 where there was no space to mount the original battery. This small battery has no problem starting my bike. Would highly recommend!

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5 of 5 people found this review helpful.


UK orders. Orders for delivery within the UK are sent by Courier.

Delivery time is 1-2 days. Priority next-day delivery: £9.95. A tracking number will be sent to you by email when dispatched. Delivery time is next day for orders received before 3pm, 2 days for orders received after 3pm.

International orders. Orders for delivery outside the UK are usually sent by UPS or other services maybe used dependant on location, shipping cost are calculated on Country and area which will be advised at point of order.

Please email or call for shipping quote.


  • Most Compact of Lithium Motorsports Batteries available- ADHESIVE BACKED FOAM INCLUDED FOR EASY INSTALLATION
  • 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 the bike is off…such as alarms, ECUs, ipods, GPS , heated grips etc…)
  • Built in the USA to high quality standards with large all brass unbreakable terminal design.
  • 3-Year Warranty—-check our website for details
  • Waterproof
Technical Details
  • 120 Cranking Amps
  • 6Amp Hours (PB Eq)
Dimensions and Weight
  • USA SIZE (LxWxH) 4.25″ x 1.25″ x 3.75″ (Height is measured to the top of the terminal bolt heads)
  • USA WEIGHT 16oz
  • METRIC SIZE (LxWxH) 110mm x 32mm x 95mm (Height is measured to the top of the terminal bolt heads)

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