GENIUS2
User Guide & Warranty
DANGER
READ AND UNDERSTAND ALL SAFETY INFORMATION BEFORE USING THIS PRODUCT. Failure to follow these safety instructions may result in ELECTRICAL SHOCK, EXPLOSION, FIRE, which may result in a SERIOUS INJURY, DEATH, or PROPERTY DAMAGE.
Electrical Shock. The product is an electrical device that can shock and cause serious injury. Do not cut power cords. Do not submerge in water or get wet.
Explosion. Unmonitored, incompatible, or damaged batteries can explode if used with the product. Do not leave the product unattended while in use. Do not attempt to jump-start a damaged or frozen battery. Use product only with batteries of recommended voltage. Operate products in well-ventilated areas.
Fire. The product is an electrical device that emits heat and is capable of causing burns. Do not cover the product. Do not smoke or use any source of electrical spark or fire when operating the product. Keep product away from combustible materials.
Eye Injury. Wear eye protection when operating products. Batteries can explode and cause flying debris. Battery acid can cause eye and skin irritation. In the case of contamination of eyes or skin, flush the affected area with running clean water and contact poison control immediately.
Explosive Gases. Working in the vicinity of lead-acid is dangerous. Batteries generate explosive gases during normal battery operation. To reduce the risk of battery explosion, follow all safety information instructions and those published by the battery manufacturer and manufacturer of any equipment intended to be used in the vicinity of the battery. Review cautionary markings on these products and on the engine.
For more information and support visit:
www.no.co/support
Important Safety Warnings
About GENIUS2. The NOCO GENIUS2 represents some of the most innovative and advanced technology on the market, making each charge simple and easy. It is quite possibly the safest and most efficient charger you will ever use. The GENIUS2 is designed for charging all types of 6V & 12V lead-acid batteries, including Lithium (LiFePO4), Wet (Flooded), Gel, MF (Maintenance-Free), Ca (Calcium), EFB (Enhanced Flooded Battery), and AGM (Absorption Glass Mat) batteries. It is suitable for charging battery capacities up to 40 Amp-Hours and maintaining all battery sizes. Getting Started. Before using the charger, carefully read the battery manufacturer’s specific precautions and recommended rates of charge for the battery. Make sure to determine the voltage and chemistry of the battery by referring to your battery owner’s manual prior to charging. Mounting. It is important to keep in mind the distance to the battery. The DC cable length from the charger, with either the battery clamp or eyelet terminal connectors, is approximately 77.7 inches (1973.6mm). Allow for 12-inches (304mm) of slack between connections. Proposition 65. Battery posts, terminals, and related accessories contain chemicals, including lead. These materials are known to the State of California to cause cancer and birth defects and other reproductive harm. Personal Precaution. Only use product as intended. Someone should be within range of your voice or close enough to come to your aid in case of an emergency. Have a supply of clean water and soap nearby in the case of battery acid contamination. Wear complete eye protection and protective clothing while working near a battery. Always wash hands after handling batteries and related materials. Do not handle or wear any metal objects when working with batteries including; tools, watches, or jewelry. If metal is dropped onto the battery, it may spark or create a short circuit resulting in electrical shock, fire, explosion which may result in injury, death, or property damage. Minors. If the product is intended by “Purchaser” to be used by a minor, purchasing adult agrees to provide detailed instructions and warnings to any minor prior to use. Failure to do so is the sole responsibility of the “Purchaser,” who agrees to indemnify NOCO for any unintended use or misuse by a minor. Choking Hazard. Accessories may present a choking hazard to children. Do not leave children unattended with products or any accessories. The product is not a toy. Handling. Handle product with care. The product can become damaged if impacted. Do not use a damaged product, including, but not limited to, cracks to the casing or damaged cables. Do not use the product with a damaged power cord. Humidity and liquids may damage the product. Do not handle product or any electrical components near any liquid. Store and operate products in dry locations. Do not operate the product if it becomes wet. If the product is already operating and becomes wet, disconnect it from the battery and discontinue use immediately. Do not disconnect the product by pulling on the cables. Modifications. Do not attempt to alter, modify or repair any part of the product. Disassembling products may cause injury, death, or damage to property. If a product becomes damaged, malfunctions, or comes in contact with any liquid, discontinue use, and contact NOCO. Any modifications to the product will void your warranty. Accessories. This product is only approved for use with NOCO accessories. NOCO is not responsible for user safety or damage when using accessories not approved by NOCO. Location. Prevent battery acid from coming in contact with the product. Do not operate the product in a closed-in area or an area with restricted ventilation. Do not set a battery on top of the product. Position cable leads to avoid accidental damage by moving vehicle parts (including hoods and doors), moving engine parts (including fan blades, belts, and pulleys), or what could become a hazard that may cause injury or death. Operating Temperature. This product is designed to work in ambient temperatures between -4° F and 104° F (-20° C and 40° C). Do not operate outside of temperature ranges. Do not charge a frozen battery. Discontinue the use of the product immediately if the battery becomes excessively warm. Storage. Do not use or store your product in areas with high concentrations of dust or airborne materials. Store your product on flat; secure surfaces so it’s not prone to falling. Store your product in a dry location. The storage temperature is -20°C – 25°C (average temperature). Never exceed 80°C under any condition. Compatibility. The product is only compatible with 6V & 12-volt Lead-Acid, AGM, and Lithium batteries. Do not attempt to use the product with any other type of battery. Charging other battery chemistries may result in injury, death, or property damage. Contact the battery manufacturer prior to attempting to charge the battery. Do not charge a battery if you are unsure of the battery’s specific chemistry or voltage. Medical Devices. Product may emit electromagnetic fields. The product contains magnetic components which may interfere with pacemakers, defibrillators, or other medical devices. These electromagnetic fields may interfere with pacemakers or other medical devices. Consult with your physician prior to use if you have any medical device including pacemakers. If you suspect the product is interfering with a medical device, stop using the product immediately and consult your physician. Cleaning. Power off the product before attempting any maintenance or cleaning. The clean and dry product immediately if it comes in contact with liquid or any type of contaminant. Use a soft, lint-free (microfiber) cloth. Avoid getting moisture in openings. Explosive Atmospheres. Obey all signs and instructions. Do not operate the product in any area with a potentially explosive atmosphere, including fueling areas or areas which contain chemicals or particles such as grain, dust, or metal powders. High-Consequence Activities. This product is not intended for use where the failure of the product could lead to injury, death, or severe environmental damage. Radio Frequency Interference. The product is designed, tested, and manufactured to comply with regulations governing radio frequency emissions. Such emissions from the product can negatively affect the operation of other electronic equipment, causing them to malfunction. Model Number. GENIUS2 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense
How To Use
Charging Modes.
The GENIUS2 has six (6) modes: Standby, 12V, 12V AGM, 12V LITHIUM, 6V, and Force. Some charge modes must be pressed and held for three (3) to five (5) seconds
to enter the mode. These “Press and Hold” modes are advanced charging modes that require your full attention before selecting. It is important to understand the differences and purpose of each charge mode. Always check with the battery manufacturer to confirm the right charge mode for your specific battery. Do not operate the charger until you confirm the appropriate charge mode for your battery. Below is a brief description:
(Peak Voltage Measured At 25°C, Amperage Rating Is Bulk Amperage When Above 0°C)
| Mode | Explanation |
| Standby | In Standby mode, the charger is not charging or providing any power to the battery. Energy Save is activated during this mode, drawing microscopic power from the electrical outlet. Canbus is enabled in Standby mode. When in Standby, the orange Standby LED will illuminate.
No Power |
| 12V | For charging 12-volt Wet Cell, Gel Cell, Enhanced Flooded, Maintenance-Free, and Calcium batteries. When selected, the 12V white LED will illuminate.
14.5V | 2A | Up To 40Ah Batteries |
| 12V AGM | For charging 12-volt AGM batteries. When selected, the 12V AGM white LED will illuminate.
14.8V | 2A | Up To 40Ah Batteries |
| 12V LITHIUM | For charging 12-volt lithium-ion batteries, including lithium iron phosphate. When selected, the 12V Lithium blue LED will illuminate. For use on batteries with Battery Management Systems (BMS) only.
14.6V | 2A | Up To 40Ah Batteries |
| 6V Press & Hold (3 Seconds) | For charging 6-volt Wet Cell, Gel Cell, Enhanced Flooded, Maintenance-Free, and Calcium batteries. When selected, the 6V white LED will illuminate.
7.25V | 2A | Up To 40Ah Batteries |
| Force Mode Press & Hold (5 Seconds) | For charging batteries with a voltage lower than 1V. Press and hold for five (5) seconds to enter Force Mode. The selected charge mode will then operate under Force Mode for five (5) minutes before returning to standard charging in the selected mode.
2A | Up To 40Ah Batteries |
Using 6V. [Press & Hold for 3 seconds]
6V charge mode is designed for 6-volt lead-acid batteries only, like Wet Cell, Gel Cell, Enhanced Flooded, Maintenance-Free, and Calcium batteries. Press and hold for three (3) seconds to enter 6V Charge Mode. Consult the battery manufacturer before using this mode.
Using 12V Lithium.
12V Lithium charge mode is designed for 12-volt lithium-ion batteries only, including lithium iron phosphate.
CAUTION. USE THIS MODE WITH EXTREME CARE. THIS MODE SHOULD ONLY BE USED WITH 12-VOLT LITHIUM BATTERIES THAT HAVE A BUILT-IN BATTERY MANAGEMENT SYSTEM (BMS). LITHIUM-ION BATTERIES ARE MADE AND CONSTRUCTED IN DIFFERENT WAYS AND SOME MAY OR MAY NOT CONTAIN A BATTERY MANAGEMENT SYSTEM (BMS). CONSULT THE LITHIUM BATTERY MANUFACTURER BEFORE CHARGING AND ASK FOR RECOMMENDED CHARGING RATES AND VOLTAGES. SOME LITHIUM-ION BATTERIES MAY BE UNSTABLE AND UNSUITABLE FOR CHARGING.
Force Mode. [Press & Hold for 5 seconds]
Force mode allows the charger to manually begin charging when the connected battery’s voltage is too low to be detected. If battery voltage is too low for the charger to detect, press and hold the mode button for 5 seconds to activate Force Mode, then select the appropriate mode. All available modes will flash. Once a charge mode is selected, the Charge Mode LED and Charge LED will alternate between each other, indicating Force Mode is active. After five (5) minutes the charger will return to the normal charge operation and low voltage detection will be reactivated.
CAUTION. USE THIS MODE WITH EXTREME CARE. FORCE MODE DISABLES SAFETY FEATURES AND LIVE POWER IS PRESENT AT THE CONNECTORS. ENSURE ALL CONNECTIONS ARE MADE PRIOR TO ENTERING FORCE MODE AND DO NOT TOUCH CONNECTIONS TOGETHER. RISK OF SPARKS, FIRE, EXPLOSION, PROPERTY DAMAGE, INJURY, AND DEATH.
Connecting to the Battery.
Do not connect the AC power plug until all other connections are made. Identify the correct polari of the battery terminals on the battery. The positive battery terminal is typically marked by these letters or symbols (POS, P,+). The negative battery terminal is typically marked by these letters or symbols (NEG, N,-). Do not make any connections to the carburetor, fuel lines, or thin, sheet metal parts. The below instructions are for a negative ground system (most common). If your vehicle is a positive ground system (very uncommon), follow the below instructions in reverse order.
- Connect the positive (red) battery clamp or eyelet terminal connector to the positive (POS, P,+) battery
- Connect the negative (black) battery clamp or eyelet terminal connector to the negative (NEG, N,-) battery terminal or vehicle chassis.
- Connect the battery charger into a suitable electrical Do not face the battery when making this connection.
- When disconnecting the battery charger, disconnect in the reverse sequence, removing the negative first (or positive first for positive ground systems).
Begin Charging.
- Verify the voltage and chemistry of the battery.
- Confirm that you have connected the battery clamps or eyelet terminal connectors properly and the AC power plug is plugged into an electrical
- [First-time use] The charger will begin in Standby mode, indicated by an orange LED. In Standby, the charger is not providing any
- Press the mode button to toggle to the appropriate charge mode (press and hold for three seconds to enter an advanced charge mode) for the voltage and chemistry of your battery.
- The mode LED will illuminate the selected charge mode and the Charge LEDs will illuminate (depending on the health of the battery) indicating the charging process has
- The charger can now be left connected to the battery at all times to provide maintenance
Auto-Memory: The charger has a built-in auto-memory and will return to the last charge mode when connected. To change modes after the first use, press the mode button.
Charging Times
Charging Times.
The estimated time to charge a battery is shown below. The size of the battery (Ah) and its depth of discharge (DOD) greatly affect its charging time. The charge time is based on an average depth of discharge to a fully charged battery and is for reference purposes only. Actual data may differ due to battery conditions. The time to charge a normally
discharged battery is based on a 50% DOD. The temperature will also impact charging times. The GENIUS2 features thermal compensation that automatically adjusts charging profiles to maximize charging performance.
| Battery Size | Approx. Time to Charge In Hours | |
| Ah | 6V | 12V |
| 8 | 3.0 | 3.0 |
| 12 | 4.5 | 4.5 |
| 18 | 6.75 | 6.75 |
| 24 | 9.0 | 9.0 |
| 40 | 15.0 | 15.0 |
Understanding Charge LEDs.
| LED | Explanation |
 |
The 25% Charge LED will slowly pulse “on” and “off” when the battery is less than 25% fully charged. When the battery is 25% charged, the red Charge LED will be solid. |
 |
The 50% Charge LED will slowly pulse “on” and “off” when the battery is less than 50% fully charged. When the battery is 50% charged, the red Charge LED will be solid. |
 |
The 75% Charge LED will slowly pulse “on” and “off” when the battery is less than 75% fully charged. When the battery is 75% charged, the orange Charge LED will be solid. |
 |
Pulsing Green LED – Bulk charge complete, optimizing battery for extended life. Solid Green LED – When the battery is 100% charged, the Charge LED will be solid green. |
 |
After the battery is fully charged, the charger will continue monitoring the battery, and provide ongoing maintenance and optimization. The 100% Charge LED will pulse “on” and “off” slowly during these cycles. The charger can be left connected to the battery indefinitely. |
Understanding Error LEDs
Error Conditions will be indicated by the following LEDs.
| LED | Reason/Solution |
 |
The charger is in Standby mode or the Battery voltage is too low for the charger to detect. |
 |
The battery voltage is too high for the selected charge mode. Check the battery and charge mode. |
 |
Possible battery short / Battery will not hold a charge. Has the battery been checked by a professional? |
 |
Reverse polarity. Reverse the battery connections. |
 |
Charger internal temperature too high / Charger will resume function once the Charger internal temperature drops. Charger ambient temperature too cold / Charger will resume function once the Charger ambient temperature rises. |
- Mode Button Push to cycle through charging Modes.
- Overvoltage Error LED Illuminates solid Red; Battery Voltage is above Protect voltage.
- Bad Battery Error LED Illuminates solid Red when the connected battery will not hold a charge.
- Reverse Polarity Error LED Illuminates solid Red when reverse polarity is detected.
- Standby LED Illuminates when the charger is in Standby Mode, the charger is not charging or providing any power to the battery.
- Charge LED indicates the connected battery(s) state-of-charge.
- Mode LED Indicates the Charge Mode the charger is currently in. Push the MODE button to cycle through charge Modes.
- [Press and Hold] Mode LED Mode button must be pressed and held for 3 seconds to enter the mode.
Technical Specifications.
| Input Voltage AC: | 120-240 VAC, 50-60Hz |
| Working Voltage AC: | 120-240 VAC, 50-60Hz |
| Output Power: | 30W Max |
| Charging Voltage: | Various |
| Charging Current: | 2A (12V), 2A (6V) |
| Low-Voltage Detection: | 1V (12V), 1V (6V) |
| Back Current Drain: | <5mA |
| Ambient Temperature: | -20°C to +40°C |
| Type of Batteries: | 6V & 12V |
| Battery Chemistries: | Wet, Gel, MF, CA, EFB, AGM, Lithium. |
| Battery Capacity: | Up to 40Ah, Maintains All Battery Sizes |
| Housing Protection: | IP65 |
| Cooling: | Natural Convection |
| Dimensions (L x W x H): | 3.7 x 2.4 x 1.7 Inches |
| Weight: | 1.1 Pounds |
3 Year Hassle-Free Warranty
NOCO warrants that this product (the “Product”) will be free from defects in material and workmanship for a period of three (3) years from the date of purchase (the “Warranty Period”). For defects reported during the Warranty Period, NOCO will, at its discretion, and subject to NOCO’s technical support analysis, either repair or replace defective products. Replacement parts and products will be new or serviceably used, comparable in function and performance to the original part, and warranted for the remainder of the original Warranty Period.
NOCO’S LIABILITY HEREUNDER IS EXPRESSLY LIMITED TO REPLACEMENT OR REPAIR. TO THE MAXIMUM EXTENT PERMITTED BY LAW, NOCO SHALL NOT BE LIABLE TO ANY PURCHASER OF THE PRODUCT OR ANY THIRD PARTY FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL, OR EXEMPLARY DAMAGES, INCLUDING, BUT NOT LIMITED
TO, LOST PROFITS, PROPERTY DAMAGE, OR PERSONAL INJURY, RELATED IN ANY WAY TO THE PRODUCT, HOWSOEVER CAUSED, EVEN IF NOCO HAD KNOWLEDGE OF THE POSSIBILITY OF SUCH DAMAGES. THE WARRANTIES SET FORTH HEREIN ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND THOSE ARISING FROM THE COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN THE EVENT THAT ANY APPLICABLE LAWS IMPOSE WARRANTIES, CONDITIONS, OR OBLIGATIONS THAT CANNOT BE EXCLUDED OR MODIFIED, THIS PARAGRAPH SHALL APPLY TO THE GREATEST EXTENT ALLOWED BY SUCH LAWS.
This Warranty is made solely for the benefit of the original purchaser of the Product from NOCO or from a NOCO approved reseller or distributor and is not assignable or transferable. To assert a warranty claim, the purchaser must: (1) request and obtain a return merchandise authorization (“RMA”) number and return location information (the “Return Location”) from NOCO Support by emailing [email protected] or by calling 1.800.456.6626; and (2) send the Product, including RMA number, and receipt to the Return Location. DO NOT SEND IN PRODUCT WITHOUT FIRST OBTAINING AN RMA FROM NOCO SUPPORT
The original purchaser is responsible (and must prepay) all packaging and transportation costs to ship products for warranty service.
NOTWITHSTANDING THE ABOVE, THIS HASSLE-FREE WARRANTY IS VOID AND DOES NOT APPLY TO PRODUCTS THAT: (a) are misused, mishandled, subjected to abuse or careless handling, accident, improperly stored, or operated under conditions of extreme voltage, temperature, shock, or vibration beyond NOCO’s recommendations for safe and effective use; (b) improperly installed, operated or maintained; (c) are/were modified without the express written consent of NOCO; (c1) have been disassembled, altered or repaired by anyone other than NOCO; (e) the defects of which were reported after the Warranty Period.
THIS HASSLE-FREE WARRANTY DOES NOT COVER: (1) normal wear and tear; (2) cosmetic damage that does not affect functionality; or (3) Products where the NOCO serial number is missing, altered, or defaced.
HASSLE-FREE WARRANTY CONDITIONS
These conditions apply only to Products during the Warranty Period. The Hassle-Free Warranty is void either by elapsed time from date of purchase (elapsed time from serial number date, if no proof of purchase) or from the conditions listed earlier in this document. Return Product with the appropriate documentation.
With Receipt:
0-3 Years: NO Charge. With proof of purchase, The warranty period begins on the date of purchase.
With NO Receipt:
0-3 Years: NO Charge. With NO proof of purchase, The warranty period begins on the serial number date.
We recommend registering your NOCO product in order to upload proof of purchase and extend your effective warranty dates. You may register your NOCO product online at: no.co/register. If you have any questions regarding your warranty or product, contact NOCO Support (email and phone number above) or write to The NOCO Company, at 30339 Diamond Parkway, #102, Glenwillow, OH 44139 USA.
For more information and support visit:
www.no.co/support
GENIUS2.01252021A
