GENIUS2D  12V 2A Direct-Mount Battery Charger and Maintainer

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Mountable, onboard charging solution.

Engineered and tested to withstand rugged working environments, like high-heat engine compartments, shock, vibration, and even water exposure. The GENIUS2D is the ultimate mountable on-board battery charger and battery maintainer for any car, boat, truck, RV, or equipment, and is designed to be located in close proximity to the battery.

Maintenance Plus.

Charge faster, safely maintain indefinitely.

This isn't an ordinary battery maintainer. We go beyond traditional maintenance charging to provide the highest return of charge that not only extends battery life, but also performance. With Maintenance Plus, it uses a proprietary charge algorithm to optimize the specific gravity of the battery, plus actively monitors battery activity and quickly refills any lost capacity every 24-hours. The result, longer battery life by proactively limiting the battery to sulfation exposure.

Maximum Power Density.

The next generation of charging.

Introducing the next-generation of battery charging with the all-new maximum power dense technology. This smart charger has insanely high performance and it is designed to be the most compact, lightweight and energy efficient charger on the market. Using advanced power conversion topologies as its foundation, the Genius 2D has significantly increased the power-to-space ratio utilizing power magnetics, consolidated components, and innovative thermal management techniques.

Thermal compensation.

Dynamically adjusts for changes in ambient temperatures.

With our innovative thermal compensation, the GENIUS2D uncovers new heights in charge performance. The GENIUS2D now features an integrated thermal sensor that automatically monitors and adjusts the charging cycle based on fluctuations of ambient temperature and enabling it to provide more precision charging in both hot and cold climates. Not only does it increase charge performance, but it improves battery life by limiting the impact of under-charging or over-charging caused by temperature changes. So now when you are charging in cold temperatures, the charging rates increase, and when in hotter temperatures, the rates will decrease. The result, better, more accurate, fully-charged batteries.

Smart battery chargers can be frustrating. Welcome to Advanced Diagnostics, which analyzes battery feedback and displays a particular error pattern if a problem is detected. Each flash pattern tells you what's wrong, and how to quickly fix it. Understanding and finding a solution is just as critical. It won't simply begin charging if it detects a weak or damaged battery, and Genius 2D won't force charge your battery if it detects an unsafe or abnormal charging condition. But prevention is just one aspect.

Single Flash: Battery will not hold a charge.
Double Flash: Battery has a short.
Triple Flash: Battery voltage is too high
Error LED Solid Red: Reverse polarity connection.
Standby LED Solid Orange: Battery voltage is too low to detect the battery.
High-Heat LED Solid Red: Ambient temperature is too high.

NOCO Genius 2D Simple Installation Drilling

Secure bracket.

Use a drill to secure the mounting bracket using self-tapping screws (included).

NOCO Genius 2D Simple Installation Attaching Strap

Attach strap.

Loop the velcro mounting strap into the mounting bracket.

NOCO Genius 2D Simple Installation Mounting Charger

Mount 2D.

Clip the Genius 2D charger into the mounting bracket.

NOCO Genius 2D Simple Installation Strapping Charger

Fasten 2D.

Fasten the Genius 2D charger using the velcro mounting strap.

Efficient design.

Compact, yet powerful battery charger.

A mix of electrical engineering and industrial design pack a powerful battery charger into a tiny footprint. Genius 2D uses high-frequency switch-mode technology to efficiency convert A/C power into safe D/C power for battery charging. And its onboard microcomputer precisely controls the charging to minimize power loss to create an incredibly compact form factor.

Technical Specifications.

What's In The Box

2 Amp Battery Charger and Maintainer
Mounting Bracket with Strap
Self-Tapping Screws
User Guide

Operating Requirements

Line Voltage: 100V to 240V AC
Frequency: 50Hz to 60Hz
Operating Temperature: -4° to 104° F (-20° to 40° C)
Storage Temperature: -22° to 140° F (-30° to 60° C)
Relative Humidity: 0 to 95% Non-Condensing


Current: 2 Amps DC
Voltages: 12V DC
Chemistry: Lead-Acid
Types: Wet Cell (Flooded), Gel Cell, Calcium, AGM, Enhanced Flooded Battery or any other Maintenance-Free Battery
Capacity Range: Up to 40 Amp-Hours
Maintenance: All Battery Sizes


Consumption: 28 Watts (Max)
Efficiency: 87%


IP Rating: IP65


Short-Circuit: Yes
Open-Circuit: Yes
Overheating: Yes
Overcharge: Yes
Spark-Proof: Yes
Reverse Polarity: Yes

Size and Weight

Height: 1.60 Inches (41 mm)
Width: 3.50 Inches (89 mm)
Depth: 2.34 Inches (59 mm)
Weight: 0.50 Pounds (0.23 kg)

Cord Management

DC Cable Length: 24 Inches (609mm)
DC Cable Size: 18 AWG
DC Fuse Size: 10 Amp Micro Blade Fuse
AC Cable Length: 24 Inches (609mm)
AC Cable Size: 18 AWG

Limited Warranty

3-Year Limited Warranty