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America's #1 Portable Emergency Jump Starter
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Transform Dead Battery Panic Into Confident Control
Professional power in your hands
No more waiting for roadside assistance
Jump starts in freezing winter weather
Fits easily in glove compartment
Spark-proof clamps prevent dangerous accidents
Professional 1000A peak current power
Ready to use in seconds
Saves hundreds on towing fees
Lasts 1000+ charging cycles
Get Back On The Road In Under 60 Seconds
Professional-grade power meets portable convenience
Jump Start Any Engine Instantly
Dead battery in a parking lot? Stranded at work? That sinking feeling when your engine won't turn over can ruin your entire day and leave you helpless.
Our 1000A peak current instantly cranks any gasoline or diesel engine, getting you mobile again without waiting for help.
Professional Grade At Home
The same 18800mAh lithium technology trusted by mechanics and emergency responders, now compact enough for everyday drivers.
Simply connect the spark-proof clamps, press the power button, and start your engine like nothing happened.
Quick 3-Minute Setup
Connect positive to positive, negative to negative, power on, and start your engine - no technical knowledge required.
Auto
Automatically detects your engine size and delivers the perfect amount of power for safe, reliable starting.
Boost
Extra power mode for larger engines, cold weather, or severely depleted batteries that need maximum cranking amps.
Safe
Spark-proof technology and reverse polarity protection prevent dangerous mistakes that could damage your vehicle or hurt you.
4 Key Features for Perfect Emergency Rescue
Everything you need when batteries fail
Engineered specifically for real-world emergency situations where reliability and safety matter most than anything else.
1000A Peak Current
Cranks any gasoline or diesel engine instantly, even in freezing weather conditions.
Spark-Proof Safety Technology
Advanced protection prevents dangerous sparks and protects against reverse polarity connection mistakes.
Dual USB Power Bank
Charges phones, tablets, and devices when you're stranded or camping off-grid.
Emergency LED Flashlight
Multiple lighting modes including strobe for roadside visibility and emergency signaling.
Get Moving in 3 Simple Steps
No technical knowledge required
Connect Clamps
Attach red to positive terminal, black to negative - spark-proof design keeps you safe.
Press Power
Hit the power button and watch the LED confirm connection - ready to start immediately.
Start Engine
Turn your key like normal - 1000A of power cranks any engine to life instantly.
Join Thousands of Satisfied Emergency-Ready Drivers
Real customers sharing their rescue stories
Over 12,000 drivers trust Cosari to get them out of dead battery emergencies, from parking lots to remote camping trips.
Sarah R - Week 2
My truck battery died in a Walmart parking lot at 9 PM. This thing had me running in under a minute - no waiting for roadside assistance or bothering strangers for jumper cables. The LED light was perfect for seeing the terminals in the dark. Absolutely worth every penny for the peace of mind alone.
David L - Month 1
Super easy to use even for someone like me who knows nothing about cars. The clamps are clearly marked and the spark-proof feature gives me confidence I won't mess anything up. Fits perfectly in my glove compartment and the USB ports have saved my phone battery multiple times during long road trips.
Nisha K - Month 3
Best $89 I've ever spent. Already used it twice - once on my own car and once to help a coworker. Both times it started the engine immediately. The build quality feels solid and professional, not like the cheap plastic ones I see at gas stations. Highly recommend to anyone who drives regularly.
Less Panic. More Control.
Stop worrying about dead batteries and take charge of roadside emergencies with professional-grade power that actually works when you need it most.
SPARK-PROOF
Compact design
Instant power
WEATHERPROOF
PORTABLE
FOOLPROOF
Why Choose Instant Self-Rescue
Control your schedule, not theirs
While others wait hours for help, you're back on the road in minutes with professional power you control.
Cosari Jump Starter vs. Roadside Assistance
Other Products In The Market
Others
Instant availability
Works anywhere
No monthly fees
Emergency lighting
Phone charging
Professional power
Spark-proof safety
12,000+ Drivers Rescued
From daily commuters to weekend adventurers across North America
4.7 stars from verified emergency rescues
The most reliable emergency power solution we've tested for everyday drivers.
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Expert Designed
Automotive Emergency Specialist
After 15 years responding to roadside emergencies, I designed the Cosari jump starter to give everyday drivers the same reliable power we use professionally. Too many people get stranded because their emergency gear fails when they need it most. This unit delivers consistent 1000A cranking power in any weather, with foolproof safety features that prevent the dangerous mistakes I see with cheap alternatives. It's the jump starter I keep in my own family's vehicles because I trust it to work when everything else fails.
Mark Stevens, ASE
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30-Day Risk Free Trial
Try it risk-free for 30 days. If it doesn't rescue you when needed, return for full refund.
America's #1 Portable Emergency Jump Starter
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4.7
Only 47 units remaining
4.7
Only 47 units remaining
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Cosari creates professional-grade emergency automotive equipment that gives everyday drivers the confidence and capability to handle roadside emergencies without waiting for help or risking safety with inferior tools.
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4.7 stars from 3,247 verified customers
3,247 reviews