The green LED may not light up when the battery is already fully charged.
Charging may be slower while the device is recording or operating at a high-resolution setting.
When the device is recording at a high resolution while charging, its temperature may rise due to simultaneous video processing and battery charging.

Do not touch the heat-dissipation area on the bottom of the main unit for an extended period.When the device is recording at a high resolution while charging, its temperature may rise due to simultaneous video processing and battery charging
When functions such as 4K recording, Wi-Fi, and GPS are used simultaneously, most of the available power may be used to operate the device.
Use a stable external power source with sufficient output.
Battery operating time varies depending on the following conditions:

The following operating times are approximate guidelines when using the built-in 3,500 mAh battery:
For extended recording, use the included waterproof charging cable and a stable external power source.
The displayed battery level is an estimate calculated from the battery voltage and other operating conditions.
The displayed level may temporarily change significantly depending on the operating load and temperature.
When the remaining battery level is below 20%, the displayed level may decrease more quickly due to battery protection.
The battery level displayed in the app may be delayed.
After use, the battery voltage may recover slightly, causing the displayed battery level to increase.
This is normal.
Some power banks automatically enter sleep mode when the current draw is low.
Use a power bank that supports low-current mode or continuous power output.

If the charging terminals are wet, allow them to dry completely before charging.