I think it's the error of the Android system. You should find a way to fix the Android system issues for your Samsung Galaxy J7 prime. Find my YouTube channel on my profile, there is a video about this.
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Sometimes a restart can fix a lot of issues like this. You should also try to force stop the camera and test it out again. Wiping the cache is a great step you can take to fix both the battery life display glitches as well as the camera issue.
Happy Monday, palmerscuddet!
Did wiping the cache, as MC suggested above, help fix the battery and camera issue? If not, please let us know so we can provide additional troubleshooting steps to get your phone back to working as it should be.