Quick answer.
The supplied charger seems to be a Qualcomm specification Quick Charge 2.0 (2014) Class A: 5 V (15W), 9 V (18W), 12 V (18W), which is why charging is very fast. It does charge from a regular USB-A 5V charger, but slower.
Long answer
I noticed that a charger was included and charging, despite 8000mAH (likely capacity of LiPoly 3.7V to 4.2V), is very fast. Though the Lenovo I had has 10,000mAH and a 2 A charger (5V supply vs average of less than 4V cell, so less than 5 hours).
Fine print on charger (read with magnfying glass)
Quote:
5V 3A (15W)
9V 2A (18W)
12V 1.5A (18W)
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By default, as it should, it is 5V. However it looks like a regular USB-A socket (and not USB 3.0 SS pins), so I don't understand how it does more than 1.5A or more than 5V, unless there is not just static sense of D- and D+, but serial data.
See
https://en.wikipedia.org/wiki/USB#Power
USB-A can be white (usually means USB 1.x to USB 2.x) having only four connections or blue (USB 3.0) having 5 additional connection pads as well the four regular strips. The five pads on a USB-A 3.0 socket are easily seen at the front. The five pins on the USB-A 3.0 plug are at the rear and harder to see.
USB 3.0 and connectors
https://en.wikipedia.org/wiki/USB_3.0
The things I have with USB-A USB 3.0 plugs are:
2 x HDD enclosures (one is using a double ended USB-A 3.0 plugs cable and one has USB-A 3.0 plug and stacked USB-B 3.0 plug.
USB-C socket to USB-A 3.0 plug adaptor
USB-A 3.0 four way hub
3 x different kinds of USB-C OTG with USB-A 3.0 sockets
1Gbps Ethernet adaptor.
All my USB-C plug to USB-A plug cables look like 4 connections only.
So how does the TCL charger work?
The white socket looks like 4 pins only. Most USB-C plug to USB-A plug cables seem to be USB 2.x, only four connections. All my cables are.
See also
https://en.wikipedia.org/wiki/USB_hardware#BCS
and (same web page):
https://en.wikipedia.org/wiki/USB_ha...Power_Delivery
My conclusion is don't use an alternate PSU or lose the one that came with it.
Quote:
Faster-charging standards
A variety of (non-USB) standards support charging devices faster than the USB Battery Charging standard. When a device doesn't recognize the faster-charging standard, generally the device and the charger fall back to the USB battery-charging standard of 5 V at 1.5 A (7.5 W). When a device detects it is plugged into a charger with a compatible faster-charging standard, the device pulls more current or the device tells the charger to increase the voltage or both to increase power (the details vary between standards).
Such standards include:
Anker PowerIQ
Google fast charging
Huawei SuperCharge
MediaTek Pump Express
Motorola TurboPower
Oppo Super VOOC Flash Charge, are also known as Dash Charge or Warp Charge on OnePlus devices and Dart Charge on Realme devices
Qualcomm Quick Charge (QC)
Samsung Adaptive Fast Charging
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A search reveals: The TCL 20 series phones use
Qualcomm's Quick Charge fast charging technology.
Quick Charge requires both the power supply and the device being charged to support it, otherwise charging falls back to the standard USB ten watts (though I thought 7.5W was the standard, which is what the faster Kobo charging uses).
Quick Charge 2.0 (2014) Class A: 5 V (15W), 9 V (18W), 12 V (18W). That matches the charger. The standard USB-C faster charging has no 12V.
So now we know how it uses a regular USB-A plug and socket without USB 3.0 connections.
The charger should be OK to charge ordinary 5V gadgets. I'd used it with my Kobo Sage before I realised it had 9V and 12V, because most USB-A sockets are 5V only!
The USB OTG adaptor with USB-C charging port should in theory support USB-C 20V. I'd need an inline USB-A measurement to see if the fast charge mode works. It certainly charges.