BOOKOO A9 Jump Starter 4000A for Car,Boat,Lawnmower 12L Gas&10L Diesel Engines Portable 12V Car Battery Jump Starter with Jumper Cables,Quick Charging USB Ports and USB C,3 LED Modes and Storage Box
$37.99
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YOUR ESSENTIAL ROADSIDE TOOL
ESCORT YOUR ROAD TRIPS
BOOKOO is a manufacturer of automotive tools and outdoor portable power station.Provide more support and power for outdoor adventures.
With 10 years of R&D and production experience, we strictly control product quality.Coupled with a 2-year and 24-hour after-sales service, we provide all drivers with better starting tools to ensure a relaxed driving journey
BOOKOO JUMP STARTER
2026 NEW JUMP STARTER
2026 NEW JUMP STARTER
What types of batteries can this battery booster start?
It can start 8.0 L gas/7.0 L diesel engines and other 12 V vehicles like motorcycles, cars, SUVs, pickups, or lawnmowers.
How often does it need to recharged?
It’s best to recharge it within 3 months.
Why did the jump starter fail to jumpstart my truck in winter?
The battery can perform optimally in extreme cold weather, even at -4ºF~149ºF
POWERFUL JUMP STARTER 4000A/20000mAh: The 74Wh portable lithium car battery jump starter can safely jump start a low volt,drain or dead car battery in seconds with this 4000A car starter, rated for gasoline engines up to 12L and diesel engines up to 10L. Can work at -4ºF~149ºF extreme environments for Passager,Truck, Garden tractor, Generator, lawn Mower, Farm tractor, Riding mower, Motorcycles, Boat, Snowmobiling, ATVs, RV, Van, SUV, Watercraft, Yacht
BATTERY JUMPER STARTER PROTABLE: Compact size and lightwight (8.6″x5.5″x3.5″,0.9lbs), easy to use and carry,can be storaged easily in the glove box of your car, safe and space-saving; comes with a storage box for the battery pack, car accessories are not easy to lose,also protects the car jumper from missed-touch
MORE THAN A CAR BATTERY JUMP STARTER: More than a car battery jump starter, the BOOKOO A9 designed with 2 USB outputs (5V/2.1A)and (5V/3A 9V/2A 12V/1.5A);The quick charge 3.0 USB port can fully charge your tablet, smartphone, GPS, camera, camcorders, Bluetooth headphones and other mobile devices at the fastest (up to 75% faster than a standard chargers)
MULTI FUNCATION JUMP BOX: Not just a jump box, it has 3 LED lights modes: Flash Light, Strobe Light, and SOS Light. This multi-purpose flashlight comes in handy in case of picnic, travel, emergency and outdoor adventures; 400LM 5W LED can work more than 10 hours,weather you take it for reading or for help
RELIABLE & 8 SAFE FEATURESL: The BOOKOO A9 jump starter 4000 A is super safe to use with 10 protections including: over-current, over-load, over-voltage,over-charge,short circuits, reverse polarity, power surging and sparking,and so forth; You can detect the errors by simply checking the lights and the beep sound from the smart jumper clamps.
LONG LASTING & LARGE CAPACITY: This A9 jumpstart was used a premium lithium-ion battery pack, 20000 mAh large capacity battery backup can start dead battery over 50 times and recharge your iPhone 4x, watch 10x, headphones 15x, suitable for more on-the-go devices; 18W Type-C input and QC 3.0 output allow you to power them up any time any where
IP66 WATER RESISTANT FOR EXTREME WEATHER: BOOKOO Jump starters fitted with a waterproof rubber stopper, allows you to start your car in raining or snowy day; And it can work easily at -4ºF~149ºF temp weather you are in California, Texas or Florida
WHAT YOU GET: A9 Jump Starter, Smart Jumper Clamps,USB Wall Charger Adapter, Micro USB A to USB C Cable, Hard carrying case, User Guide, lifetime technical support,24-month warranty and worry free after-sale service 24/7
8 reviews for BOOKOO A9 Jump Starter 4000A for Car,Boat,Lawnmower 12L Gas&10L Diesel Engines Portable 12V Car Battery Jump Starter with Jumper Cables,Quick Charging USB Ports and USB C,3 LED Modes and Storage Box
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$37.99
Discerning Bertram –
Simple, Affective and Cheap.
absolutely first class product. My car had been dead for 4 days. The neighbour was going to lend me his jumper kit but he didn’t come round, so I bit the bullet and bought this. I bought the wrong one at first, a trickle charger which was is somewhat useless you leave it to charge for a couple of days. Then I saw this little beauty and wink wink, it was love at first charge. It started my car first try and I am not looking back. Charges fast too, and thank god for over night delivery. Who said all corporations are evil. This is a must have for anyone. Small enough to carry whenever you leave the house and just have it about you. It’s very simple to use, just make sure you have at least 25% change on the device to give you the power you need.
R. Hale –
Has the Power
This is a great device. I purchased two for my vehicles. It will start old diesels or new gas engines. Has great power. Highly recommend for a quick jump source while taking up only a small amount of room Great case.
Arthur Thomas –
Saved my bacon so many times!
Some of these reviews are brutal. I have borked my battery or alternator on my new car, and I have not had time to get it into the shop. I have used this cool little gadget to jump start my car at least 4 times a day, to go where I’m going. What a pain in the butt to do, but it has saved my bacon! I even jumped some random car at my hotel, after jumping mine! I bought a handful of these for loved ones, you should do the same! Much safer and practical than waiting for AAA again. or asking a stranger to jump your car. Five stars, could nor be happier
The man –
Life saver
Works great, saved me and family a good amount of times in the past 2 years. It would be 5 stars but it tends to lose charge over time and needs to be recharged.
john –
Easy to use and light to carry.
This is the neatest item I have bought lately. My old lawnmower need jumped off every time and I have a giant jumper with built in air pump that I don’t need every time so I got this and tried it was impressed. I have to jump the old mower off every time after running its fine but this jumper is light and powerful starts it right up. Bring it back in the house and charge it next to my chair and it’s ready to go the next time. It’s light to carry and handle just a plug and play. Has the % charge when you plug it in.
Amazon Customer –
A fantastic battery jumper
Last Tuesday I had to go to a rental property to make minor repairs. I turned the key and heard clicks from the car. I connected a battery charger and a few minutes later the engine started. I drove to the property with the battery charger and completed the repairs. It was time to leave so I connected the battery charger again but the battery was too far gone to crank the engine. I had to call AAA for a jump. I got back home and the next day I called Advance Auto Parts to have a Diehard battery delivered. I waited all day Friday for the battery but it never came.I called the store and was told the delivery driver decided not to deliver the battery. Now I pay $100 a year for AAA emergency roadside service but I don’t like to wait for the service. Over the past 22 years I called AAA twice. The drivers are usually unfriendly and rude. I decided to buy a portable battery jumper so I signed up for Amazon Prime One Week Trial Membership to get the next day delivery. I found this battery jumper and ordered it Saturday and it was delivered Sunday.The jumper had a 70% charge and I thought I would see if it would start the engine. I turned they key and the engine started right up. The jumper’s charge dropped to 58% so I plugged in the charger and waited for 100% charge. It took about 2 hours. Monday morning I connected the jumper again and drove to City Auto Supply to buy a new AC Delco battery.I didn’t know portable jumpers were available in such a small package. I thought they were the big and bulky ones the AAA drivers used to carry. This battery jumper is only 6″ x 3″ x1-1/4″. I like the sleek design and it comes in a nice case as well. It is simple to use. You just have to pop off the round Engine Start button and connect the black and red flexible hoses to the jumper. They will go in only one way. Then connect the red clamp to the positive terminal of the battery and the black clamp to the negative terminal of the battery and then turn the key normally.I would recommend this jumper to any car owner. It could be very useful if you need a jump and don’t have emergency road service. It is well worth the price.
Eric Dean –
Great product. Great build quality.
I am preparing for a road trip through two national parks and really needed to have this for peace of mind. I have also charged items in my house like phones, etc. and it does really well. CONS: The instructions are far too brief.
Muddymike –
I RETURNED, BOOKOO Horrible battery jump pack, wouldn’t start a 4 cylinder engine with a full charge
I;m glad I needed this Jump pack right after I bought it as it was, is junk… It would NOT start a weak battery in my gas 4 cylinder engine in a Skid steer machine I own. I used a small lawn mower battery with a set of jumper cables in place of this jump pack and the 4 cylinder engine cranked right up and the lawn mower battery is 1 1/2 years old!I ended up buying a GOOLOO 4000 WATT jump pack and I hope it performs as well as claimed by other people who own one! It was also on sale for $99.99 at the time I bought it..Don’t go cheap with a jump pack folks as I once tried as you will hate yourself later on..WOLFPACK 4000 is also a great Jump Pack if you need a good or better model.. Still a hundred bucks but worth it all day long.. I flipped a coin when I made my choice on buying either one! LOL.