Charge the battery fully.
Press the power button on the battery until the LED’s on the front of the battery light up.
Plug the battery into the garment.
Press the power button again on the battery to select the heat level desired (Four lights = 100% heat, Three lights = 75% heat, Two lights - 50% heat, One light = 25% heat).
Press and hold the power button to turn off.
To check the battery’s remaining fuel life, unplug the battery from the garment, hold the power button, and check the number of LED lights flashing. Four lights = maximum life, One light = minimum life.