PureGear Extreme Charger
Another excellent Quick Charge capable device that you'll want to consider for the G4 is from PureGear. The Extreme Quick Charge 2.0 certified charger has a 2.4a output for extremely fast charging, and our favorite part of this charger is the wall prongs fold away for portability.
This is great as you'll have the fastest charging possible in a small form factor that won't take up two spots on the wall, and then you can fold it down for easy storage while traveling. This is another I've bought for traveling purposes, and is an excellent all around charger. Get it for $29 (on sale for $7).
Buy from Amazon Now only $7