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Battery life depends on many things. Temperature and camera settings affect it. On line you can find a chart that will show you but it generally runs between 1 hour to 1-1/2 hours. Frame rate and resolution are the main factors.
If I'm not mistaken you can either charge battery in the go pro with the GoPro USB-c cord that comes with it.. or you can buy the docking station and charge battery's separate from go pro. Making it so you can drop a battery in and keep filming! Hope this answered you question