FAQs About Antigravity Products

Select a topic below for related FAQs about Antigravity Lithium Batteries for motorcycles, powersports and automobiles. Get answers to frequently asked questions on proper charging methods, choosing the right size, what to know about lithium, and how to avoid issues.

What are the specifications of your Lithium Batteries?

You can download this PDF sheet for specs:

Antigravity Batteries Specs Comparison

You can also see the specifications of each battery on its product page. Visit our Downloads page for other product info documents.

How do I store the battery?

In the case that you need to store your bike for a long period of time, you should disconnect the battery. If you’re storing the battery out of the bike just put it in a cool dry place and cover the terminals with tape to protect from accidental shorting of the positive and negative terminals. The battery can hold its charge for up to a year, but check it every 6 months. Do not leave a battery connected if you know you will not be riding for a long time.

Is there a Warranty?

Yes a “best in the business” 3 year warranty; please visit our Warranty page to learn more.

When you look at a warranty between different manufacturers look at the detail… we see some of the other companies who make similar style batteries have shorter warranties and warranties that are voided if you get salt on their battery terminals, or if you tighten the terminal to over 5lbs of torque… or if you allow the voltage to drop below 12V… We feel these limitations only show a lower build quality of those batteries. Make sure you compare warranties in detail. We offer the strongest warranty out there.

You don't ship to my address. Where can I find an Authorized Reseller?

Please visit our Authorized Dealer Map to find one near you.

Electrical / Charging

What is the range of Voltage for your Lithium Batteries?

13.2 – 13.4 V.

The Antigravity Battery normal voltage is 13.2V. The battery will read up to 14.7V immediately after charging. The normal operating range will read between 13.3-14.5V. After a few hours it will self-balance to the 13.3-7 range which is its normal state of charge. The maximum voltage the battery should be exposed to is 14.7V. On the lower end of the voltage range the battery should be put on a charger if the battery voltage drops below the 12.5V range while sitting. The voltage should not be allowed to drop below 11V while at rest. Permanent damage may occur below 11 volts.

How do I charge the battery?

The Antigravity Battery comes ready to install, and start the bike/vehicle. We do offer two brands of Lifepo4 chargers: our Antigravity brand and the Optimate brand. We have a 4-amp and an 8-amp charger. It will charge the battery to its intended peak voltage and will shut off when the battery is charged.

Do I need a special Charging System on the Motorcycle or Car to work with a Lithium Battery?

Our lithium batteries will operate perfectly fine with the stock charging system in most motorcycles, powersports vehicles and automobiles. Where the problem can occur is when charging the battery with a standalone charger. Additionally if you have an aftermarket charging system on your vehicle, note that we cannot warranty the battery for use with aftermarket charging systems due to the fact that we do not test with these and some of these are not regulated as strictly as a stock/standard system found in a motorcycle, powersports vehicle or automobile.

Can I use my Battery Tender or Lead/Acid Charger on a Lithium Battery?

No. We do not recommend using any battery tender or other lead-acid standalone charger with a lithium battery. The reason is that lead-acid chargers will tend to overcharge a lithium battery. Additionally lead-acid chargers often have special modes like Desulfation Modes that can spike the voltage to the battery. This can damage a lithium battery.

See the Chargers and Maintainers we offer for Lithium-Ion Starter Batteries.

Can I use any type of Lithium Charger on the Antigravity Battery?

NO! This can be dangerous. You should ONLY ever use a Motorsport/Powersports specific Lithium Charger or Maintainer for your lithium battery. Using other chargers can potentially cause an explosion or fire. Lithium has different chemistries and not all lithium chemistries are the same and thus require different chargers. Use only lithium chargers rated for Lifepo4 Lithium Iron Phosphate at the recommended charge rate.

Chargers and Maintainers

What is the maximum Charge Rate for an Antigravity Lithium Battery?

The maximum charging rate will depend on the battery model, and can be found on the battery’s front label.

Does this battery require Trickle Charging?

In most cases no… The battery is Maintenance Free and can hold a charge for up to a year PROVIDED the bike/vehicle does not have a PARASITIC DRAIN or accessory taking the energy. IF your vehicle’s charging system is in good working order and you do not have any “parasitic drains” on the bike you should not have to charge this battery; rarely if ever. If you do have longer layoffs, or your bike has accessories creating a drain, you can purchase one of our battery chargers specifically designed for this Lifepo4 technology.

Fitment / Sizing

How can I find what battery to use in my vehicle?

Use our Battery Finder to see the models of Restart (OEM size) or Small Case batteries that will fit in your stock motorcycle or powersports vehicle.

Note that depending on how you use your motorcycle or car, you may not find the best result for your needs in our Battery Finder. For example you may want a higher capacity battery if you do a lot of motorcycle touring. Or if you have a race car then you may want to contact us to personally help you choose the best battery for your application.

What is the difference between your SMALL CASE Batteries and new RE-START Batteries for Motorcycles/Powersports?

Our Small Case batteries are great for race use and custom builds. They are made to be the smallest format, highest power lithium battery you can buy. They come with onboard balancing and work fine in everything from stock motorcycles to world-class race cars. They come in a small case format that is a more “universal” fit for most vehicles and are not a direct exact fit for stock motorcycles. These batteries do not have the full battery management system that our “Re-Start” batteries offer, but they actually offer a bit more in terms of pure power and a bit more amp hour capacity.

In comparison our Re-Start (RS) batteries are intended more for direct replacement of lead-acid batteries in stock vehicles or mildly modified vehicles. The RS batteries offer a direct OEM drop-in fitment but also have a full circuit board with Battery Management System (BMS) that protects the battery from over-discharge and overcharge. So they fit directly into the size format of the lead-acid battery they are replacing while offering a number of protections plus our “restart” feature, which offers a reserve capacity. This allows you to restart your vehicle if it is accidentally overcharged. This restart feature is like having built-in jumpstarting. Learn more about our exclusive Re-Start Technology.

When should I choose a SMALL CASE battery over the RE-START Battery?

Our Small Case batteries are most often used in applications where the vehicle has been heavily modified and there is no longer space available for the OEM/stock battery. The Small Case is a favorite of custom builders, and can also be ideal for racing. It is critical that you select a Small Case battery that is large enough for your application in BOTH cranking amps AND capacity. Some considerations:

1. The Small Case battery often has a bit more amp hours than the Restart version.

2. The Small Case batteries are molded to be in the smallest format possible so they can fit a more universal fitment requirement.

3. The Small Case batteries do not have a full protection battery management system like the Restarts. So in some circumstances the Small Case version can be more beneficial for certain applications where you may need a battery that won’t shut off if the voltage gets too low, such as for airplanes or some newer cars that have a start stop system.

4. For comparison: the Restart battery has a full battery management system with the restart feature and prevention of over-discharge and damage to the battery if the battery was to be over-discharged by leaving the lights on, etc. Whereas the Small Case battery has a balancing circuit board inside but does not have the low-voltage cut-off and overcharge and over-discharge protections of the Restart battery.

Can I use a Smaller or Larger Battery for my vehicle?

Yes you can. It will depend on the application you use the vehicle in. For example if you ride more often on longer distance rides, like Touring or Adventure riding, you would want more AMP HOURS (Capacity), so you would want to go with the Heavy Duty (HD) Versions of the Batteries. But if you are a regular street rider not often going on longer road trips you will be fine with the regular version of the battery. But if you Race you might want to get a smaller battery for extra savings on weight since you will not have all the accessories of a regular street vehicle.

What is the smallest size battery I can use for my vehicle?

This will ultimately depend on the vehicle’s motor size and if that motor has high-performance parts and was built either “tightly” or “loosely”. So there are many variables to consider when determining the smallest size battery possible. The key is to not put too small of a battery that will be over-stressed and will not have a long life cycle.

1. In general our Restart batteries are recommended for direct replacements in stock and standard motorcycles as they come from the manufacturer. Our Restart batteries are intended to replace the battery in those stock vehicles and our part numbers reflect the same part numbers typically of the manufacturer’s stock battery. When using the Restart battery you should only go with the recommended stock size or our Heavy Duty (HD) version of the stock size.

2. See the FAQ above for when to choose Small Case over Restart. Generally, when using our Small Case batteries, the AG-401 can be used in motorcycles up to 450cc, the AG-801 can be used in motorcycles up to 750cc, the AG-1201 can be used in motorcycles up to 1200cc, and an AG-1601 can be used in motorcycles up to 1800cc.

But it should be noted that this depends specifically on the application in which you intend to use the battery – for example if it is a custom bike with a high performance motor you should go up one size. Also note that in race car applications you can use batteries as small as the AG-1201 depending on the motor size. Examples of best uses can be found on any battery’s page.

Contact us for more details.

Can I put too big of a battery in the bike?

As long as the battery fits into the battery tray of your bike and can be connected correctly and safely a larger size will not hurt the bike but just allow for more Power and Capacity in Amp hours.

Why don't you carry specific sizes for older bikes?

Our Small Case size batteries will work for fitment for most older bikes being they are a Universal Fit. But we do not make sizes for older bikes because they are not made and rarely requested from customers.

Can you make a special size battery for me?

Though we can make a special battery for some persons who may want a higher capacity battery, in general we do not often do this. If we do make a custom battery it has to be within the sizes of cases we already make and only some sizes can be made with a larger battery inside of them.

Lithium Battery Info

What type of Lithium does Antigravity Batteries use?

We use Lithium Iron Phosphate also called LifePo4. It charges and works perfectly fine with all 12V vehicle systems, provided the stock system is charging correctly.

What type of cell does Antigravity use?

We use what is called a prismatic/pouch cell. We do not use cylindric cells.

Can Lithium catch fire? I've heard of Tesla and airplanes and hoverboards catching fire.

With any energy dense battery there is a potential for fire to occur. But the facts are that there are circumstances that create the issues where the battery can go into what is called Thermal Runaway. Properly manufactured Lithium Batteries are safe. But certain circumstances should be avoided and proper care and maintenance of a lithium battery is vital to help avoid this condition.

Our most recent batteries – the RE-START line of products – have a complete Battery Management System (BMS) that offers the protections needed inside the battery so it cannot get to a point of Thermal Runaway.

What protections are built into your RE-START Batteries?

1. They prevent the vehicle from draining the Re-Start battery below 12 volts over time. This is good for preventing “parasitic drain” issues.
2. They prevent the vehicle from draining the battery below 8 volts during cranking. This prevents it from being used in an application too large for what is intended.
3. They protect against occasional spikes in voltage beyond 14.8. This does NOT include when a regulator has failed and allows system volts to constantly rise above 14.8.

What protections are built into your SMALL CASE Batteries?

Our Small Case batteries only have a BMS (battery management system) built-in for cell balancing and are not to be over-discharged or over-charged; they do not have protections against that.

How long will the battery last?

This battery should last about 4-5 years, but this will be determined ultimately by how it is used and treated by the consumer. The type of use as a “starter battery” application provides for long life especially if all is well with your electrical system. But in racing and abusive use the lifespan may be much less. Also, parasitic drains or over-discharging or over-charging the battery will shorten life dramatically or ruin the battery. Just make sure you are disconnecting the vehicle if in storage and that you do not over-charge or let the battery drain below 11V and all will be good for a long time.

What can damage your Lithium Batteries?

Over-Discharge or Over-Charge are the most common causes of damage to lithium batteries.

1. Discharging them below 11 volts. (Only applicable to non-Restart batteries.)

  • A) Leaving the battery connected to an unused vehicle for a week or more.
    When your vehicle is not running (or being ridden) the battery is not being recharged. The vehicle’s ECU, instrument cluster, theft alarm or other accessories are actively using the battery’s energy. If you do not ride enough these “Parasitic Drains” may drain the battery below 11V relatively fast; this may damage your battery! Watch for this and use a charger maintainer if you are not riding often.
  • B) Your regulator is faulty and the vehicle is relying more on the battery than it should for powering the vehicle’s electronics.
    Older vehicles from Pre-1995 most often have bad voltage regulators by this point in time (over 20 years old). Bikes to be especially concerned about are the 1960s through 1980s vehicles that are often Re-habbed, Modified or made into Custom bikes and Bobbers. These would include Harley Davidsons, and the Honda CBs, CTs etc… Yamaha XS and other bikes of these eras. YOU MUST UPDATE TO A NEW SOLID-STATE VOLTAGE REGULATOR. Having a bad voltage regulator can severely spike the voltage to a lithium battery and cause catastrophic failure and potential for a battery melting down and smoking with a potential for fire in worst case scenarios. Do not install a lithium battery in your vehicle if you have not updated these older systems!
  • C) You mainly use your vehicle for brief trips and the battery is being drained a lot from cranking without allowing time for the vehicle to charge the battery.
  • D) The battery is being used in an application where the charging system is not being used (e.g. “total-loss” racing systems).

2. Subjecting the battery to a constant charging voltage above 14.8. (Applicable to all battery categories.)

  • A) You are using a standalone lead-acid charger instead of a lithium-ion charger. Lead-acid Chargers will over-charge Lithium-Ion batteries and will create a physical swelling of the battery and in worst case scenario cause the battery to melt down. Do not use Lead/Acid Chargers on Lithium Batteries!
  • B) You are using a non-intelligent charger which cannot properly identify the state of the battery.

3. Subjecting the battery to a constant charging current above the “max charge” current stated on the label.

Issues / Problems

My Battery has swollen, expanded or is bulging; why? Is it covered under warranty?

Typically our batteries will not expand or swell in the vehicle. In almost every case where our battery did happen to swell or bulge the reason was from overcharging it, and was almost always in older Harley-Davidson motorcycles or pre-1990s Japanese and European bikes with defective voltage regulators (we recommend you update that if you have an older bike). Here are a couple typical reasons why the battery may be overcharging:

1. The bike is an older 1960s through 1980s motorcycle that has an older style voltage regulator that has gone bad. Most of the bikes from these eras had a mechanical voltage regulator that due to age is now defective and not controlling the voltage and charge to the battery. These old broken voltage regulators can spike voltages of up to 28V to our lithium battery which in some cases can cause swelling and damage to the battery as well as a potential for thermal runaway and even explosion or fire. Our instructions clearly state in the user’s manual to check your system for proper voltage regulator operation. We always recommend a new “plug and play” voltage regulator to update any vehicle’s voltage regulator in pre-1990s motorcycles.

2. Another reason for a battery swelling is that the user is charging the lithium battery with a lead-acid charger or a battery tender type charger. These chargers can overcharge lithium batteries and will cause damage to the lithium battery which include swelling and overcharging with the potential for causing a fire. Therefore we only recommend using a specific lithium charger for motorcycles and vehicles using LIFEPO4 batteries.

Chargers and Maintainers we offer for Lithium Batteries.

We at Antigravity Batteries want you to be extremely happy with the product. We have used only the highest quality components in the building of our batteries. But being that Lithium-Ion is a newer technology, please make sure to read the User’s Manual and review all the product safety information before use and installation. The User’s Manual has much more information to get the most from your product, and safely install, maintain and operate your new Lithium-Ion Motorsports Battery. User Manuals can be found on our Downloads page.

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