How many cranking amps does this have?

All it says on the back of the unit is 12v output and Maximum 4000Amps. There is nothing in the manual mentioned. You can't use it on any other than 12 volt batteries that have gone dead. After 9 months of not using it, it showed 100% charge; after 12 months of not using it, it says 80% charge. Pretty amazing. The clamps are very well made and 100% copy inside. Hope that helps.

How long does it hold a charge for? the jump starter i keep in my car is always dead when i go to use it and i charge it once a month.

I used it about four times and then put it to charge. It still had some life to it because the blue indicator lights had some bars. I guess it depends on how much power it takes to charge your car.

A lot of reviews say it didn't jump their diesels. Ad says it will, dead or alive. What gives? I have a 6.7 and a 7.3.

Hello, our mechanical protection system works different from other brands. Hence when starting a dead battery, it’s required to long press boost button until indicator turns green to override low voltage protection. Mjs101B is definitely good for diesels.

How much start current it have

I don't know how much current it delivers, but it started a COMPLETELY DEAD V-6 Jaguar, (not even a "clicking" noise dead battery) like it had a brand new battery. Spun it right over as though it didn't have any spark plugs in it. Amazing!!! I bought one because the tow truck drivers swear by them, and who would know better than those guys?

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⚡ Power up your ride and your life—never get stranded again!

MASSIVE CAPACITY - 27,000mAh battery ensures multiple jump starts without recharge anxiety
BUILT IN 12 V SOCKET - Doubles as a portable power supply for automotive gadgets—no extra cables needed
UNMATCHED JUMP POWER - 4500 amps to start even the toughest 12V engines in freezing conditions
VERSATILE ENGINE SUPPORT - Reliable for petrol & diesel vehicles over 10L—SUVs, trucks, and more
QUICK CHARGE 3 0 USB PORTS - 75% faster charging for your devices, cutting downtime in half

The AUTOGEN 4500A Jump Starter Power Bank is a rugged, high-capacity 27,000mAh lithium battery pack delivering 4500 amps to jump start large petrol and diesel engines over 10 liters. Equipped with Quick Charge 3.0 USB ports and a built-in 12V socket, it serves as both a powerful emergency starter and a versatile portable power source. Designed with heavy-duty copper alligator clips and intelligent safety features, it ensures reliable, safe use in all conditions.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Fantastic and great service. Shipping was faster than expected.

1 week ago

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Manufacturer	AUTOGEN Technology
Brand	AUTOGEN
Model	MJS111B
Product Dimensions	17.48 x 26.49 x 12.5 cm; 1.85 kg
Batteries	1 Lithium Polymer batteries required. (included)
Item model number	MJS111B
Manufacturer part number	MJS111B
Amperage	4500 Amps
Item Weight	1.85 kg

AUTOGEN 4500A Jump Starter Power Bank (10.0L + Petrol & Diesel), 27000mAh Portable Jump Starter, 12V Lithium Battery Jumper Box for Cars, SUVs, Trucks. Giant Power Bank with Quick Charge 3.0

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