These are approximate charging times for a battery at 50% depth of discharge.

*Charging times for GENIUS2D, GENIUS2X2, and GENIUS2X4 will be similar to GENIUS2.

NOCO Genius is able to detect and charge dead batteries as low as 1-volt. For extremely dead batteries lower than 1-volt, manually turn on Force Mode to detect and charge batteries all the way down to zero volts.

How do I use Force Mode on Genius?

It is not recommended to run a load on the batteries while they are being charged.

Genius can be used to charge Lead-Carbon batteries by using 12V Mode.

Selecting the appropriate charger for your battery will depend on its Amp-Hour (Ah) capacity size. This is usually listed on the battery label at the 20-hour rate, for example: “100 AH @ 20HR”. Check your battery for its rated Amp-hour capacity.

NOCO Genius is able to detect and charge dead batteries as low as 1-volt. For extremely dead batteries lower than 1-volt, manually turn on Force Mode to detect and charge batteries all the way down to zero volts. Follow the links below to learn how to use Force Mode on Genius.

Repair Mode is an advanced battery recovery mode found on GENIUS5 and GENIUS10 for repairing and storing, old, idle, damaged, stratified or sulfated batteries. Not all batteries can be recovered. Batteries tend to become damaged if kept at a low charge and/or never given the opportunity to receive a full charge. The most common battery problems are battery sulfation and stratification. Both battery sulfation and stratification will artificially raise the open circuit voltage of the battery, causing the battery to appear fully charged, while providing low capacity. Use 12V Repair in attempt to reverse these problems. For optimal results, take the 12-volt battery through a full charge cycle, bringing the battery to full charge, before using this mode. 12V Repair can take up to four (4) hours to complete the recovery process and will return to Standby when completed.

Using Repair Mode on Genius5

Using Repair Mode on Genius10

CAUTION: USE THIS MODE WITH CARE. THIS MODE IS FOR 12-VOLT LEAD-ACID BATTERIES ONLY. THIS MODE USES A HIGH CHARGING VOLTAGE AND MAY CAUSE SOME WATER LOSS IN WET (FLOODED) CELL BATTERIES. BE ADVISED, SOME BATTERIES AND ELECTRONICS MAY BE SENSITIVE TO HIGH CHARGING VOLTAGES. TO MINIMIZE RISKS TO ELECTRONICS, DISCONNECT THE BATTERY BEFORE USING THIS MODE.

Supply Mode, found on GENIUS10, converts the charger to a constant current, constant voltage DC power supply. It can be used for powering any 12VDC device, like a tire inflator, oil changer and more. As a power supply, it can also be used to retain a vehicle’s on-board computer settings during battery repair or replacement. 13.6V Supply provides 13.6-volts at 10A with overload protection at 12A (Max).

Using Supply Mode on Genius10

CAUTION: USE THIS MODE WITH EXTREME CARE. SUPPLY MODE DISABLES SAFETY FEATURES AND LIVE POWER IS PRESENT AT THE CONNECTORS. DO NOT TOUCH CONNECTIONS TOGETHER. RISK OF SPARKS, FIRE, EXPLOSION, PROPERTY DAMAGE, INJURY, AND DEATH.

It is normal functionality for Genius to go sometimes go straight to Maintenance Mode after normal charging is complete.

View above to learn more about the Charge LEDs on Genius.

When GeniusPRO has a slowly pulsating green LED it means the charger is in Maintenance Mode. After the battery is fully charged, the charger will continue to provide ongoing maintenance and optimization until disconnected.

Click here to learn more about the Charge LEDs on GeniusPRO25.

Click here to learn more about the Charge LEDs on GeniusPRO50.

If the Overvoltage LED is illuminated, this means the battery's voltage is too high for the charge mode that is selected. For example, if you have a 12V battery and have selected a 6V charging mode selected.

If the Overvoltage, Bad Battery, and Standby LEDs are flashing together, either the charger's internal temperature is too hot, or the ambient temperature is too cold for operation. If the charger's internal temperature is too hot, the charger will stop displaying the error and resume function after the charger cools down. If the ambient temperature is too cold, the charger will resume function when the ambient temperature rises.

If a charge LED and Standby mode are flashing this means Genius is in Force Mode. After 5 minutes, the charger will return to the normal charge mode operating and low voltage detection will be reactivated.

When in Force Mode all safety features will be disabled.

How do I use Force Mode on Genius?

Genius uses a Mini® Blade fuse which can be purchased at hardware or automotive stores.

All NOCO Genius Chargers are marked with a unique serial identification number, usually found stamped on the side or edge of the unit. Click the link below to find the serial number location on each model.

Locating the Serial Number on Genius

If the Standby LED is illuminated it means that Genius is in Standby Mode and it is not recognizing that it is connected to a battery. This can happen when there is no battery connected to the charger, if the voltage on the battery is lower than the recognition threshold (1V), if the connection to the battery is faulty, or if the inline fuse is faulty or loose in the fuse housing.

How do I use Force Mode on Genius?

Depending on the battery condition and size, Genius can get up to 85°C or 185°F while it is charging the battery. This would be considered normal operating conditions.

If the Bad Battery Error LED is illuminated, this means that the battery is not holding a charge, or there may be a short in the battery. We recommend taking the battery into a local battery shop for a thorough evaluation of its health and status.