I recently bought a Pro Controller for two reasons. First, I sent my L JoyCon to Nintendo to fix the connection issues, and second, because I had read so much about the 40+ hour battery life. So I plug the new Pro Controller into my Switch and it charges overnight. First use - 3 hours, then the "low battery" notice on the screen. Put it back on the charger. Charges overnight again. This time I got a little less than 6 hours before the "low battery" message. Does it need to build up to a full charge or something? Did I get a dud?