It will charged the battery too ? Or is only a jump starter?

The manufacturer is correct, this is a jump starter only, not a charger. This unit only has a 35 watt hour capacity, it is not designed for charging. You need to purchase an appropriate 12 volt smart charger, such as a Noco Genius Charger. You should not need more than a 10 amp charger/maintainer. If you need a portable charging solution, there are large power stations with 110V AC inverters built in that you could plug a smart charger into. For example the Jackery 500 has a 518 watt hour battery with built in 110 volt (pure sine wave) AC outlet (500 watt max) for $500 on Amazon. It is 13 lbs, but I believe it would be just enough capacity to recharge a drained car battery with a Noco Genius charger. A typical car battery is about 50 amp hours of capacity. Say you had a battery that was at a 50% Depth of Discharge (recommended is 20%); this would be 25 amp hours @ 12 volts = 300 watt hours that need to be charged. Then you would have to account for AC inverter and DC converter inefficiencies. Therefore: (518 Wh x .85 x .8) / 300 Wh = 1.17 full charges. This should be just enough to fully charge a typical car battery. Keep in mind that this would not be enough to charge a larger (>50 Ah) deep cycle battery. P.S. The Noco Boost XL GB50 (jump starter) has 10,500 joules over 3 seconds = 292 amps @ 12V (for 3 seconds).

Will the novo boost 25000 charge cell phones

Yes, the Noco GB50 can charge a cell phone via the USB outlet. It's internal battery has 35 watt hours of capacity; or 9,459 mAh @ 3.7 volts. A typical cell phone has a 3,000 mAh battery. Here's a formula to determine number of charges: (power bank capacity x .85) / phone capacity = number of full charges (9,459 mAh x .85) / 3,000 mAh = 2.68 full charges

Can this be used on 4 cylinder motors?

Not answering for the makers but personally I have jump started a Tundra V8 and two SUVs with 4 cylinders and works great every time. Buying children these for Christmas. Will not ever use cables and another vehicle ever again.

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Description

⚡ Power up your peace of mind—jumpstart, charge, and shine anywhere, anytime!

COMPACT RUGGED - Lightweight 1.7 lb design with IP65-rated water, dust, and impact resistance—fits perfectly in your glove box or emergency kit.
SMART SAFETY TECH - Patented spark-proof and reverse polarity protection ensures foolproof, worry-free connections every time.
INSTANT POWER SURGE - 1500 amps of ultra-safe lithium power to jumpstart engines up to 7.0L gas & 4.5L diesel—never get stranded again.
ILLUMINATE NAVIGATE - Integrated 200-lumen LED with 7 light modes including SOS and strobe—your ultimate roadside companion.
ALL IN ONE EMERGENCY ESSENTIAL - Doubles as a portable power bank to recharge your devices on the go—stay connected when it counts.

The NOCOBoost GB50 is a compact, ultra-safe 1500A lithium jump starter designed for 12V vehicles with engines up to 7.0L gas and 4.5L diesel. It offers up to 30 jump starts per charge, integrated spark-proof and reverse polarity protection, a 200-lumen multi-mode LED flashlight, and doubles as a portable power bank. Rugged and lightweight with IP65-rated durability, it’s engineered for reliable emergency power and convenience on the go.

Specifications

Brand	NOCO
Product Dimensions	4"D x 8.25"W x 4.75"H
Item Weight	1.7 Pounds
Amperage	1500 Amps
Peak Output Current	1500 Amps
Specification Met	UL
Cable Length	2.5 Feet
Manufacturer	NOCO
UPC	046221180176
Global Trade Identification Number	00046221180176
OEM Part Number	GB50
Automotive Fit Type	Universal Fit
Model	GB50
Item Weight	1.65 pounds
Item model number	GB50
Batteries	1 Lithium Ion batteries required. (included)
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	GB50
Bulb Type	LED
Special Features	1500A 12V Portable Lithium Car Battery Jump Starter, 200 Lumen LED Flashlight, Portable Power Bank for USB Devices, Reverse Polarity and Spark-Proof Protection

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