I watched some videos on Youtube and there it looks like QC is disabled for output but working for input?
Based on my quick testing, when passthrough charging is used, QC output is disabled, but QC input can still work (ie. the powerbank is being charged at 12v, whereas the device thatâs connected to the powerbank can only be charged at 5v).
Ah, so that was you :D
Did you see me? 
But good to know that pass-through charging and QC on the input work at the same time.
While browsing around, I notice another new model from Xiaomi â Mi Powerbank 20000mAh 2C PLM06ZM:
http://www.xiaomitoday.com/xiaomi-mi-powerbank-2c-20-000mah-review-almost-lower-price-tag/
It is supposed to be a lower-priced alternative to the 2nd-gen PLM05ZM (Mi 20000mAh 2). The PLM05ZM was released (in China) for RMB (CNY) 149, whereas the PLM06ZM is RMB (CNY) 129.
But from above review, the lower-cost also means it seems to be a slight step back:
- weight has increased (v1 = 338 grams ; v2= 330.5 grams ; v2C = 358 grams) - the heaviest of the lot (but still a good deal lighter than many 20000mAh powerbanks from other brands (usually 420-460 grams if using Li-Ion instead of Li-Po)
- the length is also slightly longer (probably why it weighs more)
- the same QC 3.0 output (only 1 port can be QC3.0 ; if both ports in use, then both ports can only manage 5v simultaneously)
- no mention of whether pass-through charging will support QC3 input+output (but likely not)
- uses Fitipower FP6601Q chipset (the BlitzWolf BW-S9 uses a FitiPower FP6600Q chipset, so likely similar protocols supported)
- QC3 input is now only 9v/2A ; the v2 PLM05ZM can have 9v/2A or 12v/1.5A input (but probably just similar charging speed) [in my test I got 12v/1.6A charging rate sometimes for my PLM05ZM]
- I notice GearBest is selling this at $29, which is still higher than prices for PLM05ZM (as mentioned, the PLM06ZM is supposed to be cheaper than the PLM05ZM, maybe as it becomes more common)
(ie. assuming powerbanks can be shipped to your country; so far I havenât found any foreign seller that allows shipping of powerbanks to my location - Philippines, not even from AliExpress [which appears to be able to ship 18650 batteries to the PHL via Turkey Post/Belgian Post] )
Yeah, ever since I signed up for that Youtube Black thing I get notifications whenever someone watches my vids 
anyone has any news about newest xiaomi 20000mah (a.k.a xiaomi 20000mah 2c), as far as i know, itâs bigger, nothing more
and quite cheaper, maybe gonna be new budget king
Actually literally two post above yours ;)
Does anyone know a simply way to force these to run at 12v all the time? Is there a wire you can bridge in the USB cable?
LOL, my bad
Thank you
QuickCharge requires a timing-dependent handshake to activate the higher voltage/power modes, which is probably a good thing, considering that 9 or 12v could be bad for a normal USB device expecting 5v.
QuickCharge requires a timing-dependent handshake to activate the higher voltage/power modes, which is probably a good thing, considering that 9 or 12v could be bad for a normal USB device expecting 5v.
Simply way to force QC 12V ist to use a QC Trigger.
http://lygte-info.dk/review/USBmeter%20QC2-3-MTK-PE%20Trigger%20J7-t%20UK.html
http://lygte-info.dk/review/USBmeter%20RD%20Tech%20USB%203.0%20tester%20UK.html
Read more about USB PP and QC at HKJâs page:
http://lygte-info.dk/info/USBinfo%20UK.html
More USB wall chargers and powerbanks with USB QC are named here:
Looks interesting , could probably also be used to limit the voltage to 5V and disable QC on the output for higher efficiency (74.4 vs. 68.4 Wh according to the table above) when time is not critical, e.g. charging the phone outdoors overnight. But itâs an extra device to carry around and adds weight. Does anyone have a better idea? My phone has no such option, at least I couldnât find it.
The other way around just use an old USB 2.0 cable
Or use a power plug/source qithout QC 
Ohh wow, thanks for that. Just what I was after! Would be nice to have an ultra portable 12v supply that is actually the correct mah rating! Do you think it would be possible to parallel two or more in increase the amps?
youâre welcome!
By the way, itâs wether necessary not practical to do a fullquote of the previous post
Which current do you need for 12V or which power do your 5V/12V devices consume?
Most powerbanks deliver 2A-2.5A per port.
If you need more than 2.5A @ 5V, you can use an y-cable.
I have a small 12v fridge that runs at 2.5amp on eco mode. Although it does have a millisecond spike on start up. So unsure if two power banks would work in parallel. I know I will only get a couple hours of run time, just more of a dual use testing of the power banks.
Why don't use a larger power source with higher capacity?
....78Wh - powertraveller.com/en/shop/portable-chargers/professional/powergorilla-now-24000mah/7grvvd
..150Wh - goalzero.com/p/352/goal-zero-yeti-150-portable-power-station-220v
..175Wh - orico.cc/goods.php?id=6482
..185Wh - maxoak.net/laptop-power-bank/show/11.html
..308Wh - enerprof.de/shop/batteries/ebike-and-pedelec-batteries/enerpower-li-ion-18650-battery-pack-re10s3p-36v-6x5-8-55ah-29e/
..400Wh - maxoak.net/portable-solar-generators/show/44.html
..434Wh - anker.com/deals/powerhouse2
..768Wh - victronenergy.com/batteries/lithium-battery-12-8v
1000Wh - poweroak.nl/en/product/ps8-english/
1425Wh - goalzero.com/p/485/goal-zero-yeti-1400-lithium-portable-power-station-220v
1500Wh - poweroak.nl/en/product/ps10-english/
Depending on what you want to do, itâs probably safer to not have it always output 12v all the time (accidentally plugging a 5v device onto a 12v output USB port will likely fry itâŚ
Anyway, this may be what youâre looking for:
5v to 12v step-up USB cable to DC 2.1x5.5mm (5v/2A => 12v/750ma max â possibly good for some low-power/basic wifi routers)
or this one (much more expensive) step up voltage regulator/converter with switch (allows switch to 9v or 12v), also DC2.1x5.5m port:
https://www.amazon.com/KUNCAN-Adjustable-Step-up-Regulator-Converter/dp/B01AY3XLEY
(the step-up module converts the 5v to 12v (this works on any 5v USB power adapter or powerbank, even non-QuickCharge ones) but lower output current only)
or a QC2.0/3.0 trigger (will need to press the buttons to trigger QC2/3 mode and get your USB QC3 power adapter / power bank to output 12v):
https://www.aliexpress.com/store/product/2016-New-arrive-QC2-0-QC3-0-MTK-PE-Trigger-USB-tester-Charger-Power-Bank-Test/2022043_32656980037.html
(this one requests the power output from the power adapter / power bank itself)
oops, didnât notice the QC2/3 trigger device already mentioned aboveâŚ
(btw, I donât think the RD Tech USB 2.0/3.0 meter posted above has a âtriggerâ mode).
Some other meters like the YZXStudio ones also have a QC2/3 trigger.
for instance, this example of a ZY1276 USB meter triggering a QC2/3 wall charger to 12v and powering a small DC12v fan:
12v @ 2.5amps = 30 watts, that seems more than most non-USB-PD power banks can supply. I wonder if a USB-PD trigger can be used to request 12v @ 2.5A (am not familiar with USB PD yetâŚ) which requires a powerbank that supports Type-C PD outputâŚ
The above are just meant as temporary âquick-fixesâ probably not designed for long-term use if you really need 12v @ 2.5A, better just get a real 12v power supply that can supply the current your 12v device needsâŚ