DJI can only see your flight data if you choose to upload it to their servers.
Unless you do that, DJI have no idea if, when, or where etc you have been flying.
The % indication isn't what matters, it's the actual cell voltages that do.
To have an idea what the issue might have been you would have to post your recorded flight data.
To do that there are a couple of options ...
1. Go to DJI Flight Log...
You haven't said what you are doing, so the obvious thing to check first is that you are doing it properly.
From your manual ....
Powering On/Off
Press the power button once and then press again and hold for two seconds to power the battery on or...