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

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.

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

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

Does it have pass through charging?

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.

Does it come with USB transformer?

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.

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XTAR PB2SL V2 USB C Battery Charger Not Included Battery -Black Color

XTAR PB2SL V2 USB C Battery Charger Not Included Battery -Black Color

Product ID: 154517421

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Details

Brand
allmaybe
Color
Black
Product Dimensions
1.08"D x x
Item Weight
3.17 ounces
Output Voltage
4.2 Volts

⚡QC3.0 & PD3.0 Fast Charging

🔋Supports 18650 & 21700 Batteries

🛡️Advanced Safety Protection

Description

🔌 Power up smarter, faster, safer—because your gear deserves the best.

RAPID POWER BOOST - Experience lightning-fast charging with QC3.0 and PD3.0 compatibility—cut your wait time and stay ahead.
REVIVE RECHARGE - 0V activation feature breathes new life into over-discharged batteries—never let power slip away.
SMART SAFETY SHIELD - Built-in over-current, over-charge, over-voltage, and short-circuit protection for worry-free charging.
DURABLE FIRE RESISTANT - Crafted from flame-retardant PC materials to ensure longevity and safety in every charge.
UNIVERSAL BATTERY COMPATIBILITY - Seamlessly charges both 18650 and 21700 batteries, making it your all-in-one power solution.

The XTAR PB2SL V2 is a sleek USB-C battery charger designed for 18650 and 21700 batteries (batteries not included). It supports ultra-fast QC3.0 and PD3.0 charging standards, ensuring rapid power delivery. Equipped with advanced safety circuits and flame-retardant materials, it protects against over-current, over-charge, over-voltage, and short circuits. The charger also features 0V activation to revive deeply discharged batteries, making it a reliable and durable choice for professionals who demand efficient and safe battery management.

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