Too bad, my Buzz has been my mainstay PV since I got it, and it's been totally problem free. I use it if my eyes are open! No problems just roatating batts with a second freshly recharged set. I think it could be a charger/batt problem, or maybe a regulator circuit issue. I have not ever noticed any set of my batts taking longer than the other to fully recharge. They seem to be very much identical in terms of recharge times. That may be happening, but if it is it can't be more than a 5 minute difference. I suspect a batt issue, but I'm guessing.