We've had this unit for around 5 months now and despite multiple permutations of how long we should leave the controllers in to charge we at most get 10 minutes use out of them. The really unfortunate thing is that I cannot find the original battery casings so we are stuck with it, rendering our Wii next to useless. I recommend that you do not purchase this device. It is a nice, practical idea, but thrown together in a dysfunctional manner. I wish we could revert to our old functional set up.