JWRitchie76
Flashlight Enthusiast
I would like to add that I have a D10 SP 1st edition. As you had mentoned about battery whine mine whines constantly on high, strobe and SOS. On high the whine only lasts a couple seconds then dies out. On strobe and SOS it beacons every time the emitter flashes. Link provided here for another common D10 problem; the switch ring sticking! This one was just started by me but I think it's worth noting in the review. https://www.candlepowerforums.com/threads/255598