Wi-Fi BacPac battery-life:
The Wi-Fi BacPac's internal Li-Ion battery lasts for 3-4 hours of continuous use.
Wi-Fi Remote battery-life:
The Wi-Fi Remote's internal Li-Ion battery lasts for 5-6 hours of continuous use. The remote's battery-life indicator icon always displays on the remote LCD screen when the remote is powered on. If the remote is paired to more than one camera, the battery-life indicator icon always displays at the bottom of the remote's LCD screen.
HERO2 Camera battery-life:
The HD HERO2 camera's battery-life is not affected by the Wi-Fi BacPac. It lasts for 2-2.5 hours of continuous use. If the Wi-Fi BacPac's battery is critically low though, the BacPac will run off of the camera's battery. This reduces the camera's battery-life by about 25%.
HERO3 Camera battery-life:
The HERO3 camera has built-in Wi-Fi. Turning on Wi-Fi reduces battery-life by about 10%.