Rokin’s batteries all contain surge protection and have to be connected properly to charge.
For Nitro and Cyclone:
First plug in the USB wall charger to the power outlet. Then plug in the battery charger to the USB wall charger that is plugged in to a outlet. Make sure that the green light on the battery charger is lit up before you screw the battery on. Once the battery charger is plugged in to the USB charger and the green light is on you are ready to screw the battery onto the battery charger. The light on the battery charger will then change from green to red and the lights on the battery button will flash in all 3 colors. It should take about 2 to 2 ½ hours to recharge the battery.
Be sure not screw the battery onto the charger before it has power and the green light is lit up.
For Thunder, Mini Tank, and Viper:
Connect the micro USB charger to either a wall charger or a charging port. Then connect your device to the micro USB charger.
The Thunder can be operated while charging.
NOTE: PLEASE DISCONNECT YOUR DEVICE WHEN CHARGING IS COMPLETE TO EXTEND YOUR BATTERY LIFE.