I have been studying the G4 to see how it behaves when it comes to charging.

I have 2 x Quick Charging 2 chargers and a 2.1amp charger and lower amp chargers.

As soon as I use the 2.1amp charger and above, the charging time speeds up. My observations detect that from 0 to 50% the speed to recharge is at the fastest speed possible.

From 50 to 70% it is slightly slower, and after 70% it charges at the slowest speed possible. QC2 chargers are faster only from 0 to 5%.

The LG charger in the box is only 1.8 amp, which charges at a reasonable pace.