Pilot reported loss of both alternators in flight during turbulence and icing conditions. The Pilot requested priority handling and diverted to make a precautionary landing.

Narrative

Aircraft X with two souls on board departed ZZZ on Date on its first flight after 100 hour inspection and prop overhaul. Conditions were MVFR for departure on an IFR flight to ZZZ1. Initial climb to 15;000 feet then to 17;000 feet. The flight encountered moderate to severe turbulence which disconnected the autopilot. We turned the autopilot back on after we deviated left of course. Once we initiated the descent into ZZZ1 we encountered icing so I turned on all the appropriate heats and deployed boots. I turned on windshield anti-ice and prop de-ice and both alternator annunciation lights illuminated. ATC was advised and ATC recommended ZZZ2 so we turned south and were given vectors and clearance to descend to 2;000 feet. Upon descent we began to load-shed and requested priority handling and then a total electric failure ensued. Continued descent and turned on emergency backup power and was cleared to land Runway XX. Needing to bleed off some speed; we circled the area and was advised no traffic in the vicinity. Once slowed tried to extend gear and heard nothing so manually cranked down the landing gear and landed with no lights or flaps. Once on the ground we asked tower to ask the Airport Rescue and Firefighting (ARFF) vehicles lead us into the ramp and shut the aircraft down once parked. After shut down turned off all electrical and fuel valves and put the airplane in a hangar at [Company]. No injuries or damage reported. IFR route given for the flight was ZZZ-ZZZZZ-ZZZ1.