Autool EM335 Car Jump Starter Unlimited Use 12V Batteryless Car Emergency Power Bank with Ultracapacitor 3mins charging time

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Autool EM335 Batteryless Car Emergency Power Bank Unlimited Use 12V Car Jump Starter with Ultracapacitor 3mins charging time


This device does not contain a battery, and only has a super capacitor (super capacitor is completely different from ordinary batteries and does not store a lot of power), so this product does not need to be charged with USB in daily life. This device can be used when the car cannot start due to insufficient engine power.

First clamp the two end wire clips to the car engine;then wait for three minutes;at last,the device can automatically turn on and start the engine with insufficient electricity.

Why clip the device to an engine that cannot be turned on?
Because the device only needs a small voltage and current of the engine to enable the device to start and perform the function of emergency starting the car engine.

Why choose us?

1. Safety mini Ultracapacitor, Batteryless, avoiding high temperature explosion;
2. The car power bank has a short charging time,only needs 3 minutes to fully charge the emergency jump starter;
3. Portable and easy to store, it is suitable for us to carry when cars need emergency charge.

Control panel description:

1)power on/off:
2)The device is fully charged, press START for 10 seconds (red button)
Press and hold the start button and the delay 10S (red button) button will be turned off.
3)The device will automatically turn on in the charging state and cannot be turned off.
4)After 30 minutes, the device will automatically shut down without operating and powering.


1.The device is designed for vehicle emergency start while running out voltage of car battery.
3.Cannot start vehicle because of low voltage of car battery, Connects the device to 12V car battery by alligator clamps, red clamp to positive and black clamp to negative. It will transfer all the rest electric power to the device capacities form car battery and indicates CHARGING on device screen. By pressing START to start vehicle while it indicates FULL CHARGE on device within 3-5 minutes. If it does not indicates FULL CHARGE after 3-5 minutes, means the car battery is running out of voltage. In this case, Please charge the device via power bank, DC adapter or other car battery, after it indicates FULL CHARGE on device screen within 3-5 minutes. Then press START button to start vehicle.
4.If the device still can not get it charged for start vehicle from above mentioned operations. Please use backup ways to recharge the device such as car battery, power bank, laptop etc.


1.TUTN ON device and when it indicates FULL CHARGE, connect the clamps correctly with car battery.
2.Press START delays 10S button (Red button), the device will display countdown in 10S. and after 10S, there will be display “TURN ON NOW”. The buzzer will also beep to indicate ready to start engine. During the process of counting down, press the START delays 10S button (Red button) again to cancel the 10S countdown. This design is convenient for one person to operate, there is enough time to enter the driving area after pressing the button.
3.Press START (Green button) to enter the start-up directly. This is convenient for two people to operate at the same time.
4.The device will display “UNDER VOLTAGE, CHARGE PLEASE” if operating under low battery.


1.Over Load & Short Circuit Protection
For overload & short circuit (start procedures are unsuccessful), the appliance generates alert (sharp beep) to warn the user, the “ENGINE” symbol will flash, please check if there is any internal fault or the engine is out of the jump start’s capability. Once remove the alligator clamps, the appliance will stop beeping.
2.Reverse Electron Polarity Protection
If the reversed electron polarity is connected, the appliance generates alert (hurried beep) to warn the user, the “CAR BATTERY” symbol will flash alternating, please remove alligator clamps are removed and reconnect correctly. Once the alligator clamps, the appliance will stop generating beep.
3.Over-charging Protection
If the DC input or the alligator clamps receive abnormal high voltage from external sources, the appliance generates alert beep to warn the user, the “BAD BATTERY” symbol will flash, please remove alligator clamps or DC input source and double check to ensure the input voltage is correct. Once the alligator clamps are removed, the appliance will stop generating beep.
4.Over Temperature Protection
If the appliance is used intensively or under extreme high temperature, micro-processor controlled electronic circuitry will prohibit the emergency start feature. Please try again after a moment or use the device under suitable environment.


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-20 Business days
Canada, Europe 10-20 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
  • If you received the wrong item you can request a refund or a reshipment.
  • If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

We do not issue the refund if:

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of . (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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