G3 has a big battery, 3000mAh and needs 1.8A+ mains/car charger to charge properly. Then, the QI standard suffers from significant transformation losses, comapred to cable charging. So, if the mains/car charger provides 1.8A, lets say 0.5A get lost in the cable, heat, etc, and if you use QI, you loose 1A (the field drops drastically with each millimeter of distance)
If the car/mains adapter used to power the QI provides low current, than the QI provides weaker charging field on its turn. Logically, G3 may be set to warn you if provided field is weaker then necessary and there is some chance that this concurring message pops up and slow or no charging happens.
So, my current charging setup (not a G3 device):
Home: stock 1.2A mains charger with stock cable - used directly works veeery fast.
Used with $10 noname chinese QI works slower, but not as slow as a standard USB port charging.
Car: Hama car charger 2.1A + 50cm thick, gold-plated cable - charges faster than stock adapter+cable.
Outdoor: ADATA PV100 power bank, 2.1A output, 5cm low resistance cable - charges faster than stock mains charger+cable.
Last edited by ymarkevich; 19th April 2015 at 06:26 PM.