Does the device need to be connected to the mains when in use and the car is not being used for a few days?

The idea is that you leave the device connected to the car and mains when not in use to keep the battery consistently charged. It can stay in the car near the battery pack ready for use.

The description for the noco genius2duk says it has a battery repair & conditioner mode, yet the comparison table says it doesn't - which is it ?

The GENIUS2D desulfates during both the 12V and 6V charging modes. It is one of the first few steps in the charging process, if the charger detects sulfation in the battery it will automatically start desulfating during the charge, there is nothing that you need to do to activate it. The 12V Repair Mode that the larger models have is an additional mode dedicated to recovering heavily sulfated, stratified, old, damaged, and/or idle 12V batteries.

Is any using adhoc rather Onboard?

Most modern cars come with modular battery’s and are covered. The idea of these units is to add a battery charger that doesn’t need to be disconnected every time. You’d just plug the charger into an extension lead which you’d keep dry under the bonnet.

I want to connect it to a power inverter in my car's boot. Will it draw much power just to trickle charge my additional battery?

The NOCO Genius chargers have not been tested to be powered by inverters or generators. In theory, it will work as long as the power requirements of the charger are met. I have listed the power requirements below for the charger, including the max amperage draw of the charger. Working VAC: 120-240 VAC, 50-60 Hz Max Draw: 28W 0.12A @ 240V AC.

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NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – For Lead-Acid Batteries

Product ID: 219844874

Details

Brand
NOCO
Colour
Black
Item weight
0.33 Kilograms
Output voltage
12 Volts
Product dimensions
8.8D x 8.7W x

⚡2A smart charging power

🔋12V lead-acid battery compatible

🌡️Temperature-compensated precision

Description

🔌 Charge smarter, drive longer — never get stranded again!

REVIVE RESTORE TECH - Pulse charging reverses sulfation and acid stratification, breathing new life into neglected or deeply discharged batteries.
DYNAMIC THERMAL SENSING - Automatically adjusts charging to ambient temperature, preventing overcharge and extending battery life.
SET FORGET MAINTENANCE - Leave it connected indefinitely with smart overcharge protection for worry-free, long-term battery health.
SMART 2 A DIRECT MOUNT POWER - Compact onboard charger that fits seamlessly under your hood for hassle-free, continuous battery care.
UNIVERSAL 12 V LEAD ACID COMPATIBILITY - Engineered for AGM, EFB, Gel, SLA, VRLA, and Start-Stop batteries—perfect for cars, RVs, marine, and deep-cycle applications.

The NOCO GENIUS2D is a 2-amp, 12V smart onboard battery charger designed for direct-mount installation. It supports a wide range of lead-acid batteries and features temperature compensation, overcharge protection, and desulfation technology to optimize battery performance and lifespan. Ideal for automotive, marine, RV, and deep-cycle batteries, it offers a reliable, set-and-forget solution with a 3-year warranty.

Specifications

ASIN	B08FCV1Q2Y
Amperage	2 Amps
Battery Charge Time	1 Hours
Best Sellers Rank	10,505 in Automotive ( See Top 100 in Automotive ) 85 in Car Battery Charging Units
Box Contents	3-Year Limited Warranty, Battery Charger User Guide, GENIUS2DUK 2A Direct-Mount Smart Battery Charger and Battery Maintainer With Integrated Eyelet Terminals
Brand Name	NOCO
Colour	Black
Compatible Devices	car, motorcycle, scooter, moped, lawnmower, ATV, quad, tractor, truck, caravan, campervan, motorhome, van, boat, leisure vehicle
Connector Types	AC: 3-pin plug (Type G), DC: Battery clamps/alligator clips
Current Rating	2 Amps
Customer Reviews	4.5 4.5 out of 5 stars (459)
EU Spare Part Availability Duration	2 Years
Input Voltage	240 Volts
Item Dimensions D x W x H	8.8D x 8.7W x 16.5H centimetres
Item Type Name	NOCO GENIUS2DUK, 2A Direct-Mount Onboard Smart Car Charger, 12V Heavy-Duty Battery Charger Maintainer, Trickle Charger and Desulfator Conditioner for AGM, Leisure, Camper, Marine and Caravan Batteries
Item Weight	0.33 Kilograms
Manufacturer	NOCO
Manufacturer Part Number	GENIUS2DUK
Model Number	GENIUS2DUK
Number of Items	1
Number of Packs	1
Output Voltage	12 Volts
Specification Met	CE, UKCA, WEEE
UPC	046221180152
Unit Count	1.0 count

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