dbpower 300a 8000mah review

After owning a few portable jump starters from DBpower, it was time to check out and review their latest, smallest and best mini jump starter to date. It’s the DBPOWER DJS40 300A. It has an 8000mAh internal battery, it may be small but it can jump-start car engines up to 2.5L.

The big draw card on this mini jump starter is its size. It’s literally the size of an iPhone 6, so it can be stored away easily. If you have a small family 4 cylinder car, this is the emergency booster pack for you.

So what can this little powerhouse do?

  • Ultra Compact Jump Starter: Jump start your vehicle up to 2.5L gas engine up to 20 times with 300 amps of peak current and heavy-duty clamps and cables. Its compact enough to store in your glove box or under a car seat.
  • Powerful Power Bank: With 8000mAh capacity, it can charge phones, tablets, Kindles and other devices at speeds of up to 2.1 amps per port overall. You can recharge the DJS40 in just 5 hours using the USB charger.
  • LED Flashlight: Built-in flashlight with 3 modes (high, strobe and SOS), offers you more light in emergency situations.
  • Safety Protection: The Intelligent jumper clamps have Over Current Protection, Short Circuit Protection, Overload Protection, Over-voltage Protection, and Over-charge Protection. This means anyone can use it and feel confident that the boost pack will protect yourself and your car.
  • Whats in the Box: DBPOWER Jump Starter DJS40, Intelligent Jumper Cables, Android USB Cable, Welcome Guide, fantastic 3-year warranty and friendly customer service.

DB Power 300A Specs

djs40 DBpower 300A 8000mah review
Model Portable Jump Starter DJS40
Color Selection Black and Yellow
Battery Capacity 8000mAh
Current Peak 300A
Number of USB Charging Ports One
Max Charging Speed 2.1A
LED Flashlight Yes
Size 5.1 x 3 x 0.8 in
Weight 0.6kg
Warranty 3 Years
Where to Buy  buy from amazon


Best Mini Jump Starter Around.

Make sure you and your loved ones can get home when stranded, with a flat battery. This will jump-start your 2.5L gas engine up to 20 times on a single charge. So it’s not a one-shot wonder. Don’t carry around a large 5kg jump pack get a powerful micro car starter.best mini jump starter lead acid jump starter vs lithium ion dbpower 8000mah

  • Will start 4 Cylinder petrol engines less than 2000cc
  • All the way up to 4 Cylinder petrol engines less than 3000cc with over 50% charge capacity.

3 Modes Emergency LED Light
It has 3 modes LED light (high, strobe and SOS flash), It’s an emergency life saver when you go camping, picnic, breakdown or in a power blackout with no lights.

Compact Design

The streamlined design makes the appearance of a well-made starter. With blue power LEDs you will immediately know how much power reserves you have left. The indicators are on the top surface, which makes it looks so cool and modern.

Choice of 2 colors black and yellow, so you will be able to match your ride.

8000mAh Portable charger
It charges cellphones, tablets, kindles, anything with a USB port and then some. Charge your device together anywhere anytime. Use it in the car to recharge either your phone or your children’s devices. The included USB cable works as a charger for both the unit and micro USB port devices.

Small Slim Footprint.
Unlike the large traditional bulky jump starter packs. The DBpower 300A peak 8000mAh portable jump starter is small enough to store in your glove-box and light enough to pack in your handbag or backpack. Compact enough to take with you as you go away on holidays. Use it to charge your devices as an emergency power bank. It’s as small as an iPhone 6 in size. 

I know people who pack these up in their camera bag luggage when on holidays. Serves 2 purposes, start your car and charge start your phone or camera.

dbpower smart compact car jump starter

Longest warranty around

At DB POWER, they provide 3 year warranty, and a very user-friendly support staff. All the information is included in the user manual. You can download the DBpower 300A user manual from here

How to Recharge DBPower DJS40

Make sure to charge this micro jump starter at least once every 4 months. This will avoid shortening its lifespan. Keeping the battery pack topped up will reduce the battery from completely depleting over time. If you do use it to charge phones and tablets, it’s also a great idea to top it up.

Don’t keep it plugged into the charge port for extended periods of time. Just recharge and disconnect.
Try to store your car booster pack in a cool and protected place. Extreme temperatures may damage the internal battery. Under a passenger or driver’s seat or in the glove box are ideal locations.

The Dbpower 300A mini battery jumper is compatible with 2.5L and lower gas engines. It can also start the most motorcycle, ATV and jet-skis. 

Check out the DBPower 300A in action.


If your car battery booster pack has less than 25% charge capacity, it may not be able to start your engine. This is because car starter motors require a large sustained in rush of current. With a nearly depleted lithium-ion jump starter, the reserve capacity will not be enough to start your vehicle.
Do not connect the positive and negative polarity together when it’s power on. 

Be also aware of some fake DBpower units being sold on places like eBay. Make sure to buy from a repeatable store or online supplier like Amazon. The last thing you need is a failure in your compact jump starter.

DB Power Accessories

Package Contents:

  • DBPOWER DJS40 Portable Jump Starter
  • Crocodile Battery Clamps with inbuilt protect features.
  • Micro USB cable
  • Instruction and user manualultra compact small dbpower 8000mah booster pack

How To Jump start a car

You can use this 300A booster pack to jump start your car.

  1. Press the On/Off button and make sure your battery capacity is over 25% charged. Fully charged is the best for full power starting
  2. Insert the jumper cables into the 12v output jumping port.
  3. Connect the red clamp to the positive (+) terminal, and the black cable clamp to the negative terminal (-)
  4. Start you car with the key.

dbpower jump start procedure

Jump starting a Toyota Prius

Most gasoline or petrol cars will have the same procedure for boosting a flat battery. Where this changes is if you have a hybrid car, like the Toyota Prius. It’s a slightly different procedure.

Basically, you have to locate the fuse box, which is on the right-hand side in the engine bay. Remove the cover and then find the main red battery terminal. Open the red flap, shown below and put your jump starter positive lead onto it.

Connect the negative to a metal part of the car, and you are good to try to jump-start your Toyota Prius. Once your car has started you can disconnect your starter leads and put the fuse cover back on. 

This DBpower 300A is the perfect jump starter for your Prius. This is due to the smaller 1.8L engine, so it is well sized for the job. So why do I recommend it, well it worked for a guy at work who had a flat auxiliary battery in his Prius and needed a jump start.

best jump starter for toyota prius
Red protection tab for jump start terminal on a Toyota Prius

I’m against using pure jumper cable leads, as so much can go wrong and there is no safety protection. So I just grabbed my micro jump starter made by DB power and put it on and we got it started. He was so amazed. I just gave it to him for a few days while he went to get his battery replaced.

Update: As so many of you had asked for a more detailed procedure on how to Jump Start a Toyota Prius as well as replace the Auxiliary battery in the rear boot. We have done a whole write-up on the steps required. You can read all about whats involved here.

DBPower 300A Peak 8000mAh portable review

After using this unit for a few months I can honestly say it’s a great quality unit. I had given it to the kids to use for our road trip. They used it in the car to charge their phones and tablets a few times during each day. Giving the compact starter a top up each night, we could make sure it never missed a beat over the 7-day road trip. They thought it was one of the best mini jump starters they had ever used due to the compact size. Before we used a larger model which sometimes just was awkward and heavy.

Our Toyota Corolla is under 2.5L engine size so we were able to test it out using an old battery we installed into the car to simulate a flat battery.

The car fired up fast with plenty of power. We tried it a few more times and there was no loss of power from this little pocket-sized car battery jumper. The only problem i have doing tests like these is having to reprogram my car radio again.

Recharging the unit was simple and easy from either a phone wall outlet charger or the car cigarette lighter port if you have one. The micro USB port is the charge port and can recharge at the rate of 2.1 Amps depending on the charger type you use. The included cable is Micro USB so it can be used to either charge the unit or use it in reverse to charge phones and tablets. 

At the end of the day, this mini battery jumper is a keeper. As a brand DBpower is hard to beat. They make some top rated jump starters as well other electronic gear, so they really know what they are doing. With over 600 positive reviews, you can rest assured knowing that you are buying a quality reliable unit.

Why we picked the DBPower over others?

The DB Power range of starters has been a favorite in our family. They just work and have never let us down. They also cater for the average man with realistic prices. We actually did a full comparison the other month on 5 of the Top Selling 8000mah pocket size jump starters and with all the features and price taking into effect, this starter came out in the top again. No wonder so many people give it 4 and 5-star reviews.



As this is the baby model in the DBPower range it’s also the cheapest. If you would like some extra starting power, or extra charge for your devices, check out our review of the DBpower 500A model and the bigger 600A jumpstarter model. Both have that extra starting juice for 6 and 8 cylinder engines. They also have 2x USB out ports for multiple phone charging. Check them out if you need more features.

For a cheap pocket-size car battery jumper, you cant go past this little gem. The DB Power 300A is small and really only suited for small to mid-sized cars, but if that’s all you have then its perfect. Remember the scout’s motto “BE PREPARED.” 


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