NOCO GeniusPro chargers are compatible with 6V, 12V & 24V batteries, including all types of 12V lead-acid, AGM and lithium-ion batteries.

NOCO GeniusPRO are 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 to use Force Mode on GeniusPRO

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, example: “100 AH @ 20HR”. Check your battery for its rated Amp-hour capacity.

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

When plugged into AC power for the first time NOCO GeniusPro will start out in Standby Mode. Press the Mode Button to switch between modes. To access 6V or 24V charging modes, press and hold the Mode Button for 3 seconds then toggle the Mode Button to the desired battery type.

How to Change Modes on GeniusPRO Chargers

Repair is an advanced battery recovery mode 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 Repair in attempt to reverse these problems. For optimal results, take the battery through a full charge cycle, bringing the battery to full charge, before using this mode. Repair Mode can take up to four (4) hours to complete the recovery process and will return to Standby when completed. Repeated repair cycles may be needed depending on size and condition of the battery, however battery temperature must be closely monitored.

CAUTION: USE THIS MODE WITH CARE. THIS MODE IS FOR 6-VOLT, 12-VOLT AND 24-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.

Using Repair Modes on GeniusPRO

NOCO GeniusPRO 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 link below to learn how to use Force Mode on GeniusPRO.

How to use Force Mode on GeniusPRO

Supply Mode converts the charger to a constant voltage DC power supply. It can be used to power 12VDC and devices, tire inflators, seat heaters 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 (12V Supply) provides 13.6-volts up to 25A. Charger output voltage will drop if output load exceeds the 25A current limit.

27.2V Supply (24V Supply) provides 27.2-volts up to 12.5A. Charger output voltage will drop if output load exceeds the 12.5A current limit.

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.

Using Supply Modes on GeniusPRO

Pressing the 5A Mode button activates Reduced Charge Current mode, which will allow the unit to operate at a charge current of 5A. This mode is available at any time and can be used with the following modes only: 12V AGM, 12V LITHIUM, 6V, 6V AGM, 6V LITHIUM, 24V, 24V AGM, 24V LITHIUM and Force mode.

Pressing the 10A Mode button activates Reduced Charge Current mode, which will allow the unit to operate at a charge current of 10A. This mode is available at any time and can be used with the following modes only: 12V AGM, 12V LITHIUM, 6V, 6V AGM, 6V LITHIUM, 24V, 24V AGM, 24V LITHIUM and Force mode.

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.

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.

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 to use Force Mode on GeniusPRO

All NOCO GeniusPRO 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 GeniusPRO

If the Standby LED is illuminated it means that GeniusPRO 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 to use Force Mode on GeniusPRO

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.

Yes. All GeniusPRO units come packaged with a carrying case for that unit. At this time we do not sell replacement carrying case.

Yes, you can find 10 foot extension cables here.

HD 10' Extension Cable For GENIUSPRO25

PRO 10' Extension Cable For GENIUSPRO50

Yes, you can find replacement clamps with eyelets for GeniusPRO on our online store.

HD Battery Clamps With Eyelets For GENIUSPRO25

PRO Battery Clamps With Eyelets For GENIUSPRO50