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It doesn't matter how many flight batteries you have for your DJI Mavic Pro, you can only fly while there is enough life left in the embedded controller battery.Because the battery is fixed inside the case and not changeable, there is no option to have spare charged up batteries and the only option is to wait while it charges - very inconvenient in the field.
At best you'll only get 1-1.5 hours out of the controller and this is a massive problem.
However there is a really simple and low cost fix. By using an external USB power pack, you can power the controller using the USB connector. It can be simply attached to the tablet or phone with Velco. You can leave this connected while you're flying and if you use something like a 10000mAh supply, you are very unlikely to drain it.
I have 6 Mavic batteries which is nearly 3 hours flying time. This won't even make a dent on the power of the external supply.
Here's the components I used, but there is is plenty of choice on ebay and Amazon - you many even have a spare external USB power supply you can use. But make sure the voltages are compatible.
TeckNet Portable Charger: www.amazon.co....
USB 2.0 Charging Cable: www.amazon.co....
USB C 3.0 Data Cable: www.amazon.co....
LowePro 16l bag: www.amazon.co....