I have the PowerPack with wireless charging. What wireless chargers do you recommend that work good, and charge fast? I was thinking about the Tylt Vu charger, but some say that it doesn't work well. Some users say I need an "adjustable coil wireless charger". Will a 3-coil work fine? (fyi the Tylt Vu is a 3-coil). Can you link what wireless charger you use that works? Thanks.