The Joye eGo-C 1000mah eGo-C Upgrade USB Passthrough Batteries can be used as a standalone battery or a USB passthrough. It allows you to get the maximum performance a battery has to offer.
The USB Passthrough batteries have two modes to switch from. One is the constant voltage output mode which gives constant 3.3V (when atomizer is under load) and is the same as normal eGo batteries. The other is full voltage output mode. In this mode, the voltage will be around 4.2V. With higher voltage, you get a harder hit with a warmer vapor.
Just press the button on the ego 5 times to turn the battery on, or off to keep it from energizing while in your pocket, handbag and so forth. When the battery power is over 50%, the battery LED is white. When the battery power is between 10% and 50%, the battery LED is sky blue. When the battery power is below 10%, the battery LED is blue.
Full Voltage Mode:
While the battery is in off mode, if you press the button down for 5 seconds the battery will flash orange meaning that when you turn the battery on, you will be operating at the full voltage the battery is capable of, this will vary as the battery loses charge. With the battery off if you hold the button down again for 5 seconds it will flash blue meaning next time you turn it on you will operating at the standard constant 3.3V