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Antigravity Battery AG801

Our Price:  £198.00(Inc. 20% VAT)(£165.00 Exc. VAT)

Model:  AG801

Weight:  784 g



In stock, immediate despatch

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  (9 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

The Antigravity Batteries AG801 8-Cell Motorsports batteries is one of the most popular models. It is an extremely powerful battery in a small package. At a very small  4.25″ Length x 2.25″ 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 and can be used for bike from 600cc street use and 1200cc race use. ADHESIVE BACKED FOAM INCLUDED IN BOX FOR EASY INSTALLATION.

  • METRIC SIZE  (L) 110 mm x (W) 58 mm x (H) 95 mm  (Height is measured to the top of the terminal bolt heads)
  • METRIC WEIGHT  784 g
Best uses
  • Capable of every day use in bikes up to 550cc
  • Great for use in all enduro bikes used for trail riding up to 550cc
  • Race use for Enduro and MX electric start bikes up to 800cc. (Excluding BMW 800cc or above and V Twin) 
  • Race and Track Day use in motors up to 1200cc. (High Performance motors should use Antigravity Batteries AG1201) - (Excluding BMW 800cc or above and V Twin) 
  • Custom builds like cafe racers or small bore customs up to 800cc. (Excluding BMW 800cc or above and V Twin) 

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 (9 Reviews):  
Write a Review and share your opinions!

Promt delivery
Tuesday, 7 December 2021  | 

Not used yet as still wiring up my cafe racer project but delivery was prompt.

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This review has not been appraised.

Thursday, 5 October 2017  | 

Fast delivery and the type of procuct i was looking for.
Small battery with great power.

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This review has not been appraised.

Antigravity batterery
Monday, 21 August 2017  | 

Super fast service.
Great product and as I'm building a cafe racer I will be using you guys for more of my stuff.

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This review has not been appraised.

Just purchased
Wednesday, 24 May 2017  | 

Fitted to a customised honda GL 500. it is small enough to fit under the seat and very light .

Had to change the regulator to a mosfet to be compatible with the Li ion.

It is as described very small and very light

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This review has not been appraised.

Good product, one detail only
Monday, 22 May 2017  | 

Very good leadtime, nice packaging, good product as expected.
Only comment is on the wiring ports that comes with two screws but no blocking features.
Either a male thread (that you can connect with nylon nuts ) or a special washer would make the connection safe, as this is for aircraft application.

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This review has not been appraised.

AG801 Battery & Charger
Monday, 1 February 2016  | 

I had been looking to find a better battery for my Honda cb400ss as the oem one was small and it didn't have enough power to start the bike in the winter. After much trawling of the internet I liked what Antigravity batteries claimed for their products. After emailing the sales team, measuring the old battery and taking advice from my local mechanic I ordered the AG801 battery and charger to go with it.
The box arrived on the Monday when it should so no complaints there, however, because the nights are still gloomy when I get home from work I had to wait until Saturday to install.
Saturday finally arrived and the weather was kind in the afternoon so after a mornings shopping with SWMBO I put some old warm clothes on and got to work.
I took the old battery out and as the cable connections were different a trip to Maplins was required to get the correct conectors.
I wired it all together and used some packing foam to make it snug in the tray and now the great switch on.
Well to say I was dissapointed was a bit of an understatement as the bike refused to fire up despite 4 or 5 attempts. So I left it for a while and SHMBO suggested trying to kickstart it so out I went again and turned it over manually 5 or 6 times (those were the days!!) then I pressed the starter and it burst into life.
Left it running for half an hour or so while I sorted out the charger. Unfortunately it hadn't come with all the leads but that wasn't a problem as I had emailed Paul at Antigravity on Tuesday and he put a lead in the post so all was well. After a bit of jiggery pokery I got the charger system how I wanted it and left the bike on charge overnight.
On Sunday morning went out and disconnected the charger, pressed the starter and 2 seconds later the bike roared into life (which was a lot quicker than the old battery on a good day!!) So, success at last as it wasn't so much the weight saving I was after as the actual starting process being quicker, consistent and reliable. I suppose the original starting sequence on Saturday may have been hampered by the fact that - the bike hadn't been started for a while and the battery straight out of the box may not have been fully charged.
Anyway, I have now left it on chage so at the weekend I will start it up again and see if there are any problems.
So, from my experience this weekend and the service I have had from Antigravity I would definately give the company and product 5 stars as hopefully the battery lives up to my expectations and takes the worry out of will it won't it start when I start using it to commute to work in 2 or 3 months time.
Would I recommend to a friend yes definately, however, I think the cost may put some people off (32 for a replacement oem battery as opposed to 180 for this one) ,however, you get what you pay for and if the worry is taken away then as far as I am concerned it is worth the money.

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2 of 2 people found this review helpful.

Antigravity Battery AG801
Thursday, 28 January 2016  | 

Item exactly as described by this website and other independent sources so quality, features and function is entirely as expected. The buying process is hassle free with good communication and delivery is FAST. I am very pleased. Thanks.

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1 of 1 people found this review helpful.

AG 801
Monday, 5 October 2015  | 

Looks like it will do the job, appears good quality, dispatched promptly. Custom bike project still in progress.

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1 of 1 people found this review helpful.

Wednesday, 11 March 2015  | 

Bike: CBR600RR 2007
I bought this battery for weight savings on a bike that see 365 days a year use on the street.

It's so light that, at first, you wonder if they forgot to put the battery in the box. I had removed the old battery the night before and though this would simply be a drop in replacement but its smaller than i could have imagined. After 20 minutes of pondering and trying out various orientations, I plucked up the courage to rip the adhesive backing off the included foam padding and set to work cramming the little battery into the gaping void that was designed for the old lead acid one.

The redesign for the 2007 CBR centralises the mass at the centre of the bike with numerous other weight saving differences over its predecessors so with this in mind I tried to have the new battery as close to the left of the battery box with the spacer foam padding out the right hand side (assuming you working from the clutch side of the motorcycle).

Next step was to work the terminals - they are sunken in which meant the tabs on the connectors for the live and earth needed bent out a little. They secure into the terminals easily after just a few millimetres of bending with the supplied screws.

Excited I wire the bike back up, turn the key and thumb the starter. The bike rips into life and I'm left with a stupid grin. Stupidly I accidentally flooded the engine by killing it too quick after the first start which led to me thinking the battery was broken after numerous failed start attempts - All I needed to do was start her up with the throttle wide open - the battery was fine.

Move forward to day to day use, the bike starts up just as quick as it did with the old 3.2KG lump so no issues there... The change in handling is immense and that was what I was looking for, the bike feels much more flickable due to the big loss of weight right at the centre of gravity and it really does show.
Having come from KTM bikes I find other brands a bit portly so this was a noticeable and worthwhile upgrade.
Very pleased - and with the three year warranty I have lots of confidence that it should last.

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11 of 11 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.


  • Ultra-Lightweight and High Power Lithium Nano-Phosphate Motorsport Battery
  • Most Compact of Lithium Motorsports Batteries.  ADHESIVE BACKED FOAM INCLUDED IN BOX FOR EASY INSTALLATION.
  • 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 unbreakable terminal design.
  • 3-Year Warranty—-check our website for details  
  • Waterproof
Technical Details
  • 240 Cranking Amps- (Cranking Amps are the power the battery has)
  • 9 Ah (PB Eq) – Amp Hours are the Capacity of a Battery
 Dimensions and Weight
  • METRIC SIZE  (L) 110 mm x (W) 58 mm x (H) 95 mm  (Height is measured to the top of the terminal bolt heads)
  • METRIC WEIGHT  784 g

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