The　power　supply　issue　for　electrical　devices　in　harsh　and　dangerous　environments　is　challenging.　This　letter　proposes　a　power　supply　solution　using　drones　as　an　energy　carrier　to　charge　such　devices.　The　drone　is　wirelessly　charged　at　the　ground-side　station　and　then　flies　to　the　target　place　to　charge　the　devices　wirelessly.　To　achieve　a　compact　and　lightweight　structure,　the　helical　coupler　is　designed　without　compensation　components　and　ferrite　on　the　drone　side.　Thus,　a　drone-side　uncompensated　bidirectional　wireless　charging　system　is　formed.　Compensation　capacitors　and　inductors　are　employed　on　the　ground　side　to　achieve　zero　phase　angle.　The　antioffset　performance　and　the　constant-voltage　output　characteristic　of　the　system　are　investigated.　The　experimental　results　verified　that　the　proposed　approach　can　be　a　competitive　solution　for　charging　devices　in　inaccessible　places.　©　1982-2012　IEEE.