Hi , what is the charge capacity for this charger ? Will it charge a 100 AH battery ?

The GENIUS1 can charge a 100 amp-hour battery, but it will be an extended charge time if the battery is completely dead. For example, the GENIUS1 would take roughly 76-hours to recharge a dead battery. For comparison, the GENIUS2 would be 37-hours, the GENIUS5 would be 15-hours and the GENIUS10 would be 7-hours.

Will it auto resume maintaining the battery after a power cut ?

It should do as I understand anytime it is used it should start up from the last setting each time, so when I go to set up the charger next time it will automatically go to the 12V set up I used the first time.

Does anyone know if i have to disconnect the car battery leads first to use this charger? or can i literally pop the hood and connect it up?

You do not have to disconnect the battery from the car.

Which model can you suggest for an audi tt, 3.2 l. the car is rarely used, but i want to keep the battery topped up

The basic model I have found to be totally satisfactory….I use it on my Mazda 2…it was recommended by the AA guy who came to start my car. Much better than my old charger.

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NOCO GENIUS1 1A 6/12V Smart Battery Charger, Trickle Charger & Maintainer

Product ID: 169905284

Details

Brand
NOCO
Colour
Black
Item weight
0.43 Kilograms
Output voltage
12 Volts (DC)
Product dimensions
10.2D x 8.7W x

⚡1A smart charging power

📏35% smaller footprint

🌡️Dynamic temperature compensation

₩149313

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Description

🔋 Genius power, tiny package—never let your battery hold you back!

COMPACT POWERHOUSE - 35% smaller yet delivers 35% more power than predecessors—charge smarter, not bulkier.
REVIVE DEAD BATTERIES - Force Mode charges batteries down to zero volts—perfect for rescuing neglected or deeply discharged batteries.
SET FORGET MAINTENANCE - Safe for indefinite connection with automatic monitoring—your battery’s health guardian 24/7.
ALL IN ONE BATTERY SAVIOR - Charges, maintains, trickle charges, and desulfates 6V & 12V lead-acid and lithium batteries effortlessly.
TEMPERATURE SMART CHARGING - Integrated thermal sensor adapts charging to ambient conditions, preventing overcharge or undercharge.

The NOCO GENIUS1UK is a cutting-edge 1A smart battery charger and maintainer designed for 6V and 12V lead-acid and lithium batteries. It features a compact design that’s 35% smaller yet more powerful, with advanced temperature compensation and desulfation technology to extend battery life. Ideal for a wide range of vehicles, it safely charges even dead batteries and supports indefinite maintenance charging, backed by a 3-year warranty.

Specifications

ASIN	B0828HMG3N
Amperage	1 Amps
Battery Charge Time	1 hours
Best Sellers Rank	143 in Automotive ( See Top 100 in Automotive ) 1 in Motorbike Battery Chargers 3 in Car Battery Charging Units
Box Contents	3-Year Limited Warranty, Battery Charger User Guide, GENIUS1UK 1A Smart Battery Charger and Battery Maintainer, Needle-Nose Battery Clamps With Integrated Eyelet Terminals
Brand Name	NOCO
Colour	Black
Compatible Devices	Boats, Campervans, Caravans, Cars, Lawnmowers, Mopeds, Motorbikes, Motorcycles, Motorhomes, Pickups, Quads, Scooters, Tractors, Vans
Connector Types	Battery Clamps, Eyelet Terminals (M6)
Country of Origin	China
Current Rating	1 Amps
Customer Reviews	4.4 4.4 out of 5 stars (4,450)
EU Spare Part Availability Duration	2 Years
Input Voltage	230 Volts
Item Dimensions D x W x H	10.2D x 8.7W x 17.1H centimetres
Item Highlight	Temperature Compensation, Overcharge Protection, Desulphator, For Lead-Acid (Wet, EFB, AGM, Start-Stop) & Lithium (LiFePO4)
Item Type Name	NOCO GENIUS1UK, 1A Smart Car Charger, 6V and 12V Portable Heavy-Duty Battery Charger Maintainer, Trickle Charger and Desulfator Conditioner for AGM, Leisure, Lithium, Motorbike and Caravan Batteries
Item Weight	0.43 Kilograms
Manufacturer	NOCO
Manufacturer Part Number	GENIUS1UK
Model Number	GENIUS1UK
Number of Items	1
Number of Packs	1
Output Voltage	12 Volts (DC)
Specification Met	CE, UKCA, WEEE
Unit Count	1.0 count

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₩149313

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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