Question 1

Can i "fast charge" my phone with this using it with 18650 (5000mah) batteries?

Accepted Answer

To get "10,000mAh" (1S2P, 2x5,000mAh type 21700 cells) you can also use:
SAMSUNG 50E 21700 5000MAH 9.8A BATTERY
I've seen these offered varying from about US$8 - $12 per cell.
9.8A continuous amps at BATTERY internal temp of 25C
Each cell is rated at 5000mAh, but the spec says the GUARANTEED minimum capacity is 4900mAh...which is pretty much normal for Li-Ion cells when capacities reach maximum levels possible with the technology. At a 1A current drain, the Samsung 21700 50E cells I've tested reliably provided individually about 4600-4700mAh to Vt=3.0V. 
(note: the Ah capacity of a battery or cell generally and normally decreases with increasing current drain. Example; a cell that tests to 4900mAh at I=100mA may test to 4600mAh at 1000mA current drain)
Warning: counterfeit batteries and cells are a problem in online commerce. Find trusted sellers that stand behind their sales and merchandise.

Question 2

Can you recommend the type of battery to buy for this please?

Accepted Answer

The higher the milliampere rating is, the longer it will last. Get a battery that is above 2500mHA

Question 3

Does it have pass through charging?

Accepted Answer

When I plug in the charger to a phone to charge the phone, or when I plug it into a power supply to charge the batteries inside the device the display lights up. When I plug in both USB cables at the same time, the display turns off, but the phone still shows that it is charging. That implies the device just passes through the power when both cables are plugged int.

Question 4

Does it come with USB transformer?

Accepted Answer

No transformer. Just the charger and a pretty decent USB C cable. Works great us it to charge my flashlight and ecig batteries when I am camping with a small solar panel. Well worth the loot.

ASIN	B07WMQCWBF
Best Sellers Rank	#21,994 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #853 in Cell Phone Portable Power Banks
Brand	allmaybe
Color	Black
Compatible Devices	pc
Connector Type Used on Cable	USB Type C
Current Rating	2 A
Customer Reviews	4.2 4.2 out of 5 stars (396)
Input Voltage	12 volts
Item Dimensions D x W x H	1.08"D x 2.28"W x 1.08"H
Item Weight	3.2 ounces
Manufacturer	SHENZHEN XTAR Electronics Co., Ltd
Mfr Part Number	PB2SL
Model Number	etqtrq-687
Number of Items	1
Number of Ports	2
Output Voltage	4.2 volts
Specification Met	UL, CE, FCC
UPC	687551690838
Unit Count	1 Count

XTAR PB2SL V2 USB C Battery Charger Not Included Battery

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