Yes

It is 150 mm long, 70 mm wide and 15 mm high.

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.

Probably only for one charge if the battery of the S24 ultra is below 20%. I can't give any product advice, but you should look for a power bank that has at least 20,000 mAh, which could be enough for two charges.

My Samsung mobile can be fully charged at least 2 times...

Yes, it is possible: as patrickbider says below, charging happens at slightly reduced power/speed. Instead of "super fast charging" with "fast charging" on my Galaxy S21 FE.

I don't know, check the instructions for your phone. Greetings

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.

Yes, you can charge the Samsung S21 Ultra with Fast Charging via the power bank. The S21 Ultra supports up to 25 W Super Fast Charging, and the power bank offers Power Delivery with up to 45 W, which is compatible and enables fast charging. However, the S21 Ultra charges with a maximum of 25 W, even if the power bank can deliver more power.

The exact charging time of the power bank depends on the charging source used. The power bank supports up to 25 W Super Fast Charging, which means that it can be charged relatively quickly. However, there is no specific indication of the charging time from 0 to 100% in the information provided. In a similar model, it was mentioned that it takes about 2.5 hours to fully charge the power bank when used with a suitable charger.

Not at all, pure recycled plastic.

Yes, the LED diodes light up while the mobile is charging. The Samsung 25W 10000mAh Wireless Battery Pack has an LED indicator that shows the charge status of the battery pack and the connected devices. When you press the power button, you can check the charge status of the battery pack via the LED diodes.

400wh is right! I am very satisfied. Price performance top top!!!

Both can be used for both. 2x USB C

Yes, for all products that can be charged with a USB-C Lightning cable

iPhone 13 works, Apple Watch did not charge for me.

I have a Google Pixel 5 and it works perfectly for me.

You will need a USB power adapter for charging. This must be compatible with the lower mains voltage. Can you charge your mobile with the USB power supply? If yes = Powerbank defective / If no = USB power supply defective/incompatible

I am satisfied

The Samsung PD Super Fast Powerbank with 20000 mAh and 3.7V has a capacity of 74 Wh.

Yes, no problem.