Questions about Samsung EB-P3300

Yes

I looked to see if I could find an instruction manual on the Internet, but unfortunately I didn't. As far as I know, the Battery Pack can only be charged via the USB-C port. I haven't tried charging the Battery Pack via the USB-A port yet, but I think that's something that's rather not intended. However, both ports serve as outputs. A maximum of 25 watts can be charged via the USB-C port and a maximum of 15 watts via the USB-A port. However, I don't know how many watts are possible with the iPhone.

I would use a simple 5 Watt power supply (no Fast Charge) for testing. If it then lights up, the Huawei power supply cannot "talk" to the power bank.

Samsung Electronics GmbH Hello, Yes, you can charge the Powerbank with the EP-T4510 charger. The power is throttled accordingly. Best regards from Schwalbach, Your Samsung Service Team

Yes, I tried it - although it is not mentioned in the instruction manual, it seems to work. I charged something on the large USB port and charged the powerbank with the USB-C port. The powerbank shows charging with the LED display, as does the device to be charged. The only question is whether it makes sense. Maybe a USB distributor (where you can charge both devices on the charger) makes more sense.

If the powerbank is properly connected (it is charged via the USB-C port); this note may help: The powerbank can be reset by holding down the power button for 7.5 seconds.

Yes, you can also charge your iPhone with it. You just need a USB/Lightning cable in some cases and I can't say how fast iPhones are charged. Unfortunately, every manufacturer has its own charging standard.