Does it need plugged in, in order to charge a battery? Or can it just be used at the side of the road?

The NOCO Genius 10 is NOT a power bank. It is a battery optimiser. You plug it into the mains power (240 VAC) and connect your vehicle battery to it. It then charges and optimises your vehicle battery (on or off the vehicle). To jump start your vehicle battery with a portable power pack, you'd need something like the NOCO Boost Plus or Boost HD. There are of course other makes of portable power pack available.

I need a standalone battery charger just leave in the boot without mains, anyone know of a brand that does this?

But you can get battery based car starters.

What is the difference between genius10 and genius10uk?

The UK one has 13Amp plug on. I ordered one and they sent charger with American plug don't get caught out !

can this be used without mains connection? i.e. standalone in the car?

No ,its not a jump starter.its abattery charger.need A/C power.its work 110 to 230 ..

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NOCO GENIUS10, 10A Automatic Smart Charger, 6V and 12V Portable Automotive Car Battery Charger, Battery Maintainer, Float Charger, Trickle Charger and Battery Desulfator with Temperature Compensation

Product ID: 239604155

Details

Brand
NOCO
Colour
Black
Item weight
3.99 Pounds
Output voltage
12 Volts (DC)
Product dimensions
11.2D x 11.4W

⚡10A rapid charging power

🔋Revives dead batteries

🌡️Smart temp compensation

B/.962

Duties & taxes included

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Charge smarter, drive stronger — never miss a start!

DEAD BATTERY REVIVAL - Force mode jumpstarts batteries down to 0 volts—never get stranded.
POWER PACKED COMPACT - 17% smaller, 115% more power for faster, efficient charging anywhere.
ALL IN ONE BATTERY CARE - Charges, maintains, trickle charges & desulfates for extended battery life.
UNIVERSAL COMPATIBILITY - Works with all 6V/12V lead-acid & lithium-ion batteries across vehicles & powersports.
INTELLIGENT TEMPERATURE CONTROL - Adaptive charging prevents overheat or undercharge in any climate.

The NOCO GENIUS10 is a compact, 10-amp smart battery charger and maintainer designed for 6V and 12V batteries. Featuring advanced temperature compensation, dead battery force mode, and battery desulfation technology, it ensures rapid, safe charging and restores battery health. Compatible with a wide range of vehicles and battery types, it’s a professional-grade, weatherproof solution for year-round battery care.

Specifications

ASIN	B07W3QT226
Amperage	10
Battery Charge Time	240 Hours
Best Sellers Rank	199,418 in Automotive ( See Top 100 in Automotive ) 774 in Car Battery Charging Units
Box Contents	(2) Black Truss-Head Screws, 3-Year Limited Warranty, Battery Charger Mounting Bracket With Velcro Strap, Battery Charger User Guide, GENIUS10 10A Smart Battery Charger and Battery Maintainer, Needle-Nose Battery Clamps With Integrated Eyelet Terminals
Brand Name	NOCO
Colour	Black
Compatible Devices	Car, Motorcycle, Boat, Lawn Mower, ATV, UTV, Tractor, Truck, Van, RV, Portable Generator, Scooter, Classic Vehicle
Connector Types	X-Connect
Current Rating	10 Amps
Customer Reviews	4.5 4.5 out of 5 stars (20,482)
EU Spare Part Availability Duration	3 Years
Global Trade Identification Number	00046221190052
Input Voltage	12 Volts
Item Dimensions D x W x H	11.2D x 11.4W x 23.1H centimetres
Item Type Name	NOCO GENIUS10, 10A Automatic Smart Charger, 6V and 12V Portable Automotive Car Battery Charger, Battery Maintainer, Float Charger, Trickle Charger and Battery Desulfator with Temperature Compensation
Item Weight	3.99 Pounds
Manufacturer	NOCO
Manufacturer Part Number	GENIUS10
Model Number	GENIUS10
Number of Items	1
Number of Packs	1
Number of Ports	1
Output Voltage	12 Volts (DC)
Product Warranty	1 Year manufacturer
Specification Met	Energy Star
UPC	046221190052

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