[LG G5 Guides, News, & Discussion] waylo:
There's a wall of text below, but you can skip all that here and just soak in my answers to some general interest questions. My data is presented below in case you want to bore yourself with the details.

See post #7 for QC3 data http://xdaforums.com/showpost.php?p=66646418&postcount=7

1. Does using a micro-USB to USB-C adapter impede charging amperage, as measured by the Android OS?

No, actually not significantly at all. I'm somewhat surprised by this.

2. Does the LG charger work as fast as a certified QC2 charger?

Yes, pretty much.

3. Does AOD affect charging rates? With QC2, the amperage drops significantly if charging with the screen on, using the phone, etc. AOD probably is different, so let's prove it.

AOD does NOT appear to affect charging rates, though if the phone is charging in a bright environment it might.

4. What are some standard temperatures in these scenarios and at rest?

During charging, the highest my phone hits is ~31-32oC. With it plugged in but not delivering any amperage, it cools to ~23oC. At rest, unplugged, depending on ambient temps, it varies anywhere in the 20s.

5. What amperage does QC2 provide at max?

~3000mA, if the battery % is low enough. And not for very long. For comparison, on my G4, the max was about ~2400mA on QC2, 1800mA with a non-QC charger.

EDIT: I've found that the Android OS cannot accurately list amperage numbers. I think this is because it presumes all input will be at 5V. With QC2 and QC3, this is no longer the case. With my USB multimeter and a QC2 charger, the max amperage is ~2.4A, which slowly drops as the charging % increases.

6. How long does it take to fully charge the G5?

On QC2.0, 1 hour 20 minutes, from 0 to 100%.

There's been some discussion regarding charging rates and charging adapters on our newly released G5s. In the US, on T-Mobile, the phone comes with a QC2-style charger, "Fast Charge." I have read this is not exactly the same an official certified QC2 (I don't know how accurate that is though).

The QC2 standard supports 4 different modes, 5V/2A, 9V/2A, 12V/1.67A, and a 20v option. For comparison, QC3 has dynamic voltage, going from 3.2v - 20v.

The 'fast charge' adapter provided by LG supports the 9v and 5v modes, though the amperage is listed as 1.8A:

9.0V @ 1.8A or

5.0V @ 1.8A

In addition to the LG stock adapter, I also have a Tronsmart QC2 charger which is rated at 5V/2A, 9V/2A, and 12V/1.5A. http://www.amazon.com/Updated-Versi...direct=true&ref_=oh_aui_search_detailpage#Ask

In addition to the stock LG-provided USB-A to USB-C cable, I have some TechMatte micro-USB to USB-C converters, Benson approved. Everyone invested in Android has tons of micro-USB cords, but USB-C not so much. These cheap adapters help with the transition. They are the #1 sellers on Amazon and available here:

http://amazon.com/TechMatte-Connect...&redirect=true&ref_=oh_aui_detailpage_o05_s00

With my 2 chargers and 2 cable set ups, I attempted to systematically document the charging using Battery Monitor Widget Pro (BMW Pro), a great app because it will log a host of stats with no user intervention. (This may not be as accurate as someone using external equipment like a Charger Doctor, but it's good enough for our purposes).

First, some general observations. The first day I had the G5 I did not activate the SIM, nor did I install all my apps. So overnight, it sat connected to wifi but not doing much else. Doze was able to get an impressive -5mA drain for much of the night. Not such a surprise since it wasn't trying to do much. This is without AOD.

Second, when the phone was going through its initial re-installation of my dozens of apps, it ran up to ~40oC. I don't think this is surprising, but it was good to nail down a number.

Third, the voltage tops out at 4400mV. The charger keeps drawing a decent mA for ~40 minutes after it hits 100%. Maybe some additional top-off juice?

Methodology - No phone interaction during the relevant measurement time. Kept whatever other background apps running. BMW Pro logged measurements every 10 minutes. Connected to wifi.

Scenario A - QC2.0 Tronsmart charger with LG-supplied USB-C cable. I would expect this to be the fastest since the charger has 3 modes to choose from (though the wattage from the 12V and 9V is technically the same) and there is no adapter to flow through.

This charging cycle data was collected after I ran my battery completely down. I then rebooted and plugged in the charger asap. This data shows the max amperage to be ~3000mA. This slowly decreases over time.

A simpler read of the charge rate data:

18% @ 10 min, 3063 ma

38% @ 20 min, 2866 ma

57% @ 30 min, 2653 ma

72% @ 40 min, 2025 ma

84% @ 50 min, 1484 ma

92% @ 60 min, 974 ma

97% @ 1:10, 538 ma

100% @ 1:20, 437 ma

Scenario B - Always on display with Tronsmart QC2.0 and USB-C cable. Does AOD change anything from Scenario A?

One thing I noticed is that the AOD is responsive to ambient lighting! So that definitely could alter whatever charging curve we record. This cycle was initially started at 0% in a room with some fading sunlight but no direct illumination. This run was hampered by the phone shutting down from a low battery at the very beginning of the cycle despite being plugged in! Maybe there was too much current demanded by the phone as it booted up and with the AOD on. So this run necessitated starting at ~2%. Hence a 2% 'bump' in the early data points.

Transcribing the data:

21% @ 10 min, 3017 ma

40% @ 20 min, 3065 ma

60% @ 30 min, 2654 ma

74% @ 40 min, 2022 ma

86% @ 50 min, 1482 ma

93% @ 60 min, 975 ma

97% @ 1:10 min, 537 ma

100% @ 1:20 min, 399 ma

Once again it takes 1:20 for a full charge. Despite the 2-3% variability on the lower end, the higher data points basically match Scenario A's. So I would conclude having AOD on does not affect charging times, though that could change if the phone was in a bright environment.

Scenario C - "Fast charge" adapter provided from LG, with micro-USB to USB-C adapter. I would have guessed this would be the slowest charge.

Starting amperage here was again ~3000mA. I didn't start this cycle at 0%, probably more like 25%, but the charging percentages coincidentally lined up remarkably well for a good comparison. (I'd want a 0% start cycle to really confirm this data which I may add in the future).

38% @ 10 min, 3065 ma.

58% @ 20 min, 2654 ma

72% @ 30 min, 2021 ma

84% @ 40 min, 1479 ma

92% @ 50 min, 974 ma

97% @ 60 min, 664 ma

100% @ 1:10 min, 419 ma

So even though the charging started at 25% battery (so obviously the time measurements can't line up), the % charged sample points line up for nearly direct comparisons to Scenario A. At each battery %, the mA are nearly identical. So I'm concluding there's very little mA loss from the adapter.

You might argue for 2 other scenarios here for full comparison, the QC2.0 charger with the adapter and the LG charger with the USB-C cable. Maybe in another update. Currently, I think Scenario A and C here would be the fastest and slowest, respectively, at charging, so showing there is no difference at the extremes makes the other 2 scenarios less important.