Battery exchanges Charging (batteries) 1 Charging mechanism 1 Charging station 1 Data mining 1 Decentralised 1 Drones 1 Electric loads 1 Fixed wings 1 Flight path and charging planning 1 Flight paths 1 Flight simulators 1 Machine learning 1 Machine-learning 1 Mission-oriented 1 Optimisations 1 Power 1 Secondary batteries 1 Solar energy 1 Wireless charging 1 data mining 1 drone 1 flight path and charging planning 1 machine learning 1 optimization 1