With the Power Supply disconnected from the battery pack main leads, set the voltage to 12V Constant Voltage (CV) and a maximum of 2A Constant Current (CC). You can ensure this is set correctly if you touch the Power Supply leads together. It should go into Constant Current mode where the maximum amperage is set and the voltage will drop.

I chose 12V here because my pack read 6.85V. Ensure to set a Power Supply voltage higher than your battery pack, otherwise sparks will fly due to the battery pack filling the capacitor of the Power Supply.

Connect the negative terminal of the Power Supply to the negative pad of the battery pack.

Connect the positive terminal of the power supply to the positive pad of the battery pack

Be sure to STOP if the battery cells expand, temperatures increase, or if a fire breaks out.