NOCO GEN & GENPRO chargers are compatible with 12V batteries, including all types of 12V lead-acid and lithium-ion batteries.

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

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.

When plugged into AC power NOCO Genius will start out in Standby Mode. Press the Mode Button to switch between modes. Follow the link below to learn how to change modes on GENIUS5, which has the same modes as GENIUS4.

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 link below to learn how to use Force Mode on GENIUS5, which has the same modes as GENIUS4.

How to Use Force Mode

Repair Mode is an advanced battery recovery mode found on GENIUS4 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. Use to link below to learn about Repair mode on the GENIUS5, which has the same modes as the GENIUS4.

Using Repair Mode on Genius4

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.

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 do I use Force Mode on Genius?

The fuse is 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.