GoPro Hero 4 session Quick Start Manual page 12

/ Getting Started
The camera status lights (red) turn on during charging and turn
off when charging is complete. When charging the camera with a
computer, be sure that the computer is connected to a power source.
If the camera status lights do not turn on to indicate charging, use a
different USB port.
WARNING: Using a wall charger other than a GoPro Wall Charger
can damage the GoPro camera battery and could result in fire or
leakage. Only use chargers marked: Output 5V 1A. If you do not
know the voltage and current of your charger, use the included
USB cable to charge the camera from your computer.
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For more battery information, see
WARNING: Use caution when using your GoPro as part of your
active lifestyle. Always be aware of your surroundings to avoid
injury to yourself and others.
Abide by all local laws when using your GoPro and related
mounts and accessories, including all privacy laws, which may
restrict recording in certain areas.
/ Getting Started
Battery (page 90).
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