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The LG G6 supports USB Power Delivery for fast charging so let's see how it works with one of the first USB Power Delivery chargers in the market, the Google Universal Type-C Charger 60W. The LG G6 battery is depleted when we start charging it with the Google Universal Type-C Charger 60W.

Initially the Google Universal Type-C Charger 60W repetitively declares its source capabilities of 15 watts (5 volts @ 3 amps), 36 watts (12 volts @ 3 amps), and 60 watts (20 volts @ 3 amps) without any response from the LG G6 which has zero charge in its battery.

After about 1 minute and 51 seconds, the LG G6 finally requests 15 watt (5 volts @ 3 amps) from the Google Universal Type-C Charger 60W. 

After a request from the Google Universal Type-C Charger 60W, the LG G6 also declares it can support 15 watts (5 volts @ 3 amps) and 27 watts (9 volts @ 3 amps).

Interestingly, after the power contract has been completed and discover identity request has been made, the Google Universal Type-C Charger 60W again repeatedly declares its source capabilities of 15 watts (5 volts @ 3 amps), 36 watts (12 volts @ 3 amps), and 60 watts (20 volts @ 3 amps).

Again, the LG G6 finally requests 15 watt (5 volts @ 3 amps) from the Google Universal Type-C Charger 60W.

After another request from the Google Universal Type-C Charger 60W, the LG G6 again declares it can support 15 watts (5 volts @ 3 amps) and 27 watts (9 volts @ 3 amps).

It's curious that the power contract has to be negotiated twice without any resets happening.

When we look at the power graphs, we can see that during the first couple of minutes while no power contract has been established, the LG G6 trickle charges at 2.5 watts (5.1 volts @ .48 amps).

After the power contract has been established, we can see that the LG G6 is pulling 15 watts (5 volts @ 3 amps) from the Google Universal Type-C Charger 60W.

After about 51 minutes as its battery becomes more fully charged, the LG G6 decides to start pulling less power, or 12.75 watts (5.1 volts @ 2.5 amps) from the Google Universal Type-C Charger 60W.

After another 4 minutes, the power drawn goes down further to 11.3 watts (5.1 volts @ 2.2 amps).

As the battery continues to be charged to full, we can see the current and power continue to step down.

It takes about 92 minutes before the lowest power step is reached or 2.5 watts (5.1 volts @ .48 amps) which is the same trickle charge level that we saw in the beginning when the LG G6 was first connected to the Google Universal Type-C Charger 60W with its battery depleted.

 It took about 100 minutes to fully charge the LG G6 using the Google Universal Type-C Charger 60W.