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Under normal circumstances, the standard GoPro HERO4 or HERO5 battery will last for one to two hours of shooting. The Blink or BlinkX can be programmed to turn the camera off between shots to only have the camera powered on when the footage is needed. However, while Blink can extend the length of time the GoPro cameras can be deployed on a single GoPro battery, the total amount of time the camera can remain powered on is still the same. The 44 Wh Battery increases the GoPro battery life by approximately 11x and has the Always On operating mode required for use with the Blink and BlinkX controllers.
BlinkX requires an external power source like the 44 Wh Battery and cannot be powered directly from the GoPro battery.
There are a lot of battery packs available, however, don't be fooled by cheaper alternatives. Most of the USB battery packs on the market have an automatic power saving feature which turns off the battery if it is not continuously supplying power. Often, this feature is not even mentioned in the battery description, and only discovered when you find the camera's internal battery is dead, even though the high powered battery pack is still fully charged.
Calculating battery life is non-trivial. It depends on the camera model, firmware version, SD card speed, lighting conditions, battery size, age of the battery, ambient temperature, and more.