M81 GX400 Intelligent 12v 4000A Multi-Function Jump Starter

M81 GX400 Intelligent 12v 4000A Multi-Function Jump Starter

Part No. GX400

Manufacturer Warranty

Fitment Guarantee

Free Shipping $99+*

Australia Owned Local Support

Contact us to confirm compability

The M81 GX400 multi-function intelligent jump starter is the perfect companion for petrolheads, boaties, bikers, off-roaders, outdoor adventurers, campers, and anyone else who needs to crank an internal combustion engine to keep or get moving.

Boasting a high-power delivery potential rivaling and exceeding most conventional lead-acid batteries, the M81 GX400 can start just about anything running on a 12V system - car, bike, boat, you name it. Capable of a peak of 4000A, and a sustained 850A for cranking, the tiny jump starter packs some serious punch. The M81 GX400 also provides the added convenience of being able to double as a work, safety and emergency light, as well as a power bank for all of your portable devices including phones and tablets. The GX400 also has the added feature of fully supported 10W wireless charging.

Its ruggedised case provides excellent shock and knock protection, and its IP65 rating allows it to serve in a wide range of environmental conditions, whether you are off the beaten track, outside the heads or anywhere else you might need to take it with you for peace of mind.

Polarity and Overload Protection

Featuring sophisticated circuitry capable of voltage sensing and able to detect a range of fault conditions, the intelligent jumper leads included with the GX400 take the risk and unwanted drama out of emergency situations. One can be forgiven for connecting leads backwards in a stressful situation, and traditional jump starters would happily let you fry your vehicles electronics in such an event, but the GX400 will not allow a discharge when reverse polarity is detected.

Equally important is the spark arresting technology, preventing potentially dangerous sparks occurring if the clamps accidentally touch together whilst reaching into the engine bay.

Charges USB devices

USB connectivity can mean a lot of things - first and foremost, the need for yet another specific cable with a bulky transformer is gone, as the GX400 can be charged through its PD60W compliant USB-C port. This means that any power source capable of providing enough juice for 'fast charging' on your mobile devices can also charge the GX400.

The usefulness doesn't stop there, as the QC3.0 capable USB-A port allows the GX400 to serve as a mobile power bank to charge other devices, and the pièce de résistance is the inclusion of a 10W wireless charging function, making the GX400 a truly versatile piece of kit. 

Long-lasting, 20,000 mAh Lithium Battery

Charging a device before using is one thing, remembering to charge it before a trip is something else entirely. The GX400 boasts a potent lithium ion battery with an impressive 20,000mAh storage capacity, and what's more, the charge is good for up to six months standby.

Built-in Flashlight

Killing multiple birds with one stone, the GX400 also features an integrated array of LEDs, capable of outputting 300 lumens, and also controllable by the user, making the GX400 a versatile tool indeed.

The selectable modes include a work light, as breakdowns rarely occur in a well lit workshop environment; a stroboscopic hazard light, handy in hairy situations; and an SOS mode, for when the going is a little too tough.

Up to 35 Starts per Charge

Despite its small size, the advanced lithium batteries in the GX400 are capable of delivering a starting charge over, and over, and over again - there are few things more frustrating than jump starting a car in a tricky predicament, only to have it stall a few metres further into a worse situation. In testing, the GX400 has performed up to 35 starts on car with a flat-but-healthy battery, meaning there is more than enough to start the whole neighbourhood.

Compact Size

Aphorisms like 'good things come in small packages' often ring true, and you might be thinking a powerful jump starter, capable of a mighty 850 cranking amps, protected in a durable case, with an IP65 ingress protection rating, would be a suitably massive unit. The powerful GX400 comes in a form factor small enough to fit in a glove box, tool kit, or any nook or cranny available for storage in your vehicle.

For added convenience, the GX400 comes with both a storage bag and a carry case, keeping it and its associated pieces safe and secure for when you need it.

Fast Charging

Rapid charging is a reasonable expectation in todays fast-paced environment, and that is exactly what the GX400 provides. Capable of achieving a full charge in 3 hours on the ideal 9V @ 2A input. Charging from lesser power sources is also supported, so the GX400 is not going to leave you high and dry when conditions aren't perfect.

Starting Capacity up to 10L Petrol & 8L Diesel*

Real-world applications are always the litmus test that separates good products from good marketing. The GX400, boasting 4000A peak and a sustained 850 cranking amp output, is capable of starting petrol engines up to 10.0L and diesel engines up to 8.0L.

* Figures tested for a vehicle with battery charge approximately 11V. When tested on 0-5V battery, the GX400 can start engines up to 8L petrol/6L diesel.

No Extra Vehicles Required

Extraordinary events often mean uncontrollable circumstances; traditional jump starts require another vehicle close by - and preferably operational. Situations requiring a jump start rarely allow the luxury of breaking down in an open space with ample lighting, and easy access to another car with room to use jumper leads. The convenience of a portable, powerful jump starter means all of this is foregone, turning your bad day into a minor inconvenience.

Large LCD Screen

Leaving nothing to chance, the GX400 also possesses an easy-to-read 4-LED display, showing state of battery charge. The bright LED's translate to visibility under all conditions, preventing an awkward situation of fooling around when the times are good, and finding out when the times are bad.

Load-sensing isn't the only job that the ingelligent jumper leads perform either, the built in display screen showing fault conditions - it can even be used to test the battery when unplugged from the main unit!


Note: can not be used on vehicles with lithium ion or lithium iron phosphate batteries. Only suitable for 12V lead-acid batteries. Lead-acid batteries include multiple construction types such as wet filled; AGM; gel-filled; enhanced flooded; silver-calcium; VRLA; suitable for starting and deep cycle applications.

Automotive Superstore may choose to allow returns on certain listings please check the individual listing to see if the item is eligible for return.

For items where returns are not available we are only able to accept a product for a refund, replacement or credit where there has been a major failure, such as:

  • When the product has been assessed and found faulty.
  • The product has been wrongly described.
  • Or the product does not meet the “fitness of purpose”.
  • You have 30 days from delivery to request an exchange, refund or store credit.

Refunds will be processed within 5 business day.

Automotive Superstore uses several different shipping methods and providers please see below for a general guide.

  • Small items - Satchel Post
  • Bulky / Heavy items - Courier
  • PO Boxes - Australia Post

Dispatch & Handling Time

Majority of items at Automotive Superstore are advertised to dispatch within 1 - 3 business days of the order being placed. Whilst 99% of orders are dispatched within this time on occasion this may not be the case due to factors beyond our control.

Please check the individual listing as shipping times may vary depending on the specific item.

If you require a part urgently please contact our friendly staff and we will be able to provide you with a more precise dispatch & shipping time.

*Heavy and bulky items being shipped to remote location may incur a shipping fee an example of such items are batteries, brakes, liquids, lift kits etc.

Order Tracking

Once your order is dispatched Automotive Superstore will issue you an email with tracking details you can also find this information by logging into your account.

Stock Availability

Dispatch and delivery time is subject to availability of stock. If a product is ordered and we are not able to dispatch the product within 5 business days a full refund or alternate product will be offered.

Will my parts be shipped together?

Majority of orders will be combined into one shipment, if for any reason should the order be split into more than one shipment tracking numbers will be provided.

All warranty claims must be directed through the eBay help centre. In order to make a claim, you must provide the Help Centre with:

  • Details of the defect or damage in relation to which you are making a claim under the warranty.
  • Photographic evidence of the defect or damage, where applicable.
  • Your invoice (including order number) and any other proof of purchase, and
  • Any other details we may need to process your claim.
  • Where goods are damaged or defective upon delivery, you must provide photographic evidence of the damage before receiving a repair, replacement or refund.
  • We reserve the right to determine which repair centre is the appropriate service location in each case.
  • You must comply with all return instructions provided to you via your registered email address when making a claim under this warranty
  • We cannot accept returns that have not been authorised through the process outlined in these terms and conditions.
  • If any returned goods are found to be in good working order, we may seek reimbursement, at our discretion, for any costs incurred by us in relation to such goods. In such cases, you agree that we may hold your goods until such payment is received.
  • Except as required by law (including the Australian Consumer Law), this warranty shall not apply in respect of goods:
    • Where the goods have not been installed, maintained, operated or used in accordance with the manufacturer’s instructions or any other specifications provided with the goods;
    • Where damage or defects are caused by deliberate or negligent misuse or abuse, physical alteration, fire, liquid spillage, use of incorrect voltage, power surges or dips, thunderstorm activity, force majeure, voltage supply problems, tampering or unauthorised repairs by any persons, use of defective or incompatible accessories, computer viruses, corrosive conditions or instruction by an insect, pest or other foreign body;
    • Where damage results from any third party software or hardware not provided by us;
    • Where items are lost or stolen; and
    • In relation to repairs of batteries, where the batteries have not been used in accordance with specifications or they expire by normal use.
    • Except as required by law (including the Australian Consumer Law), our liability under this warranty shall not exceed the amount of the purchase price of the goods or the replacement of the goods with the same or a similar product.
    • In the event that storage media ordered from us becomes faulty, fails or otherwise detrimentally affects software or data stored on it, except as required by law (including the Australian Consumer Law), we will not be liable for any loss or damage to the software or data, however arising.
    • You should maintain a backup of all software and data stored on your devices. If you return media (such as a hard disc drive), whether separately or as a part of a larger electronic or computing product, to us for any reason, including for replacement or repair, we will not be responsible for any software or data stored on the media. We make no representation that we will be able to repair or replace any product without risk to or loss of the software or data.

If you are entitled to make a claim under this warranty, our staff will provide you with instructions as to how the goods may be returned to us at our expense (either you will be reimbursed for standard postage or, for larger items, we will organise a courier to retrieve the items). Unless otherwise provided by law, you will bear any other costs incurred in making a claim under this warranty.

Automotive Superstore is a group of Australian automotive enthusiasts with more than 50 years combined experience in supplying retail products.

With our extensive understanding of the automotive parts industry we are very aware that visiting a retail store can be intimidating for some customers particularly when they don’t have a lot of knowledge about vehicles and parts. They have to contend with the well meaning but misinformed sales person who recommends the wrong product (you don’t find out until too late when trying to install it on your vehicle!) or the lack of customer service which leads to having to make your own product selections and "hoping for the best”. Plus there is the inflated pricing, having to re-schedule your day to visit when the store is open and the hassle of finding a car park.

We have provided vehicle owners with the most professional, convenient and affordable automotive parts store in Australia.