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This form factor of this device suggests it contains 8x 18650 3000mah samsung batteries.
If you have a Samsung device with adaptive fast charging, I suggest getting a powerbank that has the fast charging chip. There are newer powerbanks from China and Singapore that also supports 2 way fast charging (plugging in your adaptive fast charger to the powerbank). Also powerbanks that contains lipo batteries are also becoming popular--its thinner and lighter, and typically have better cycles. Dropping a 1 lb plastic powerbank is not fun, especially when it falls with the USB cable. This doesn't seem serviceable so I'm skipping this one out. The USB header solder on the PCB on this is typically the weak spot.
This is a meh deal but it does have dual 2.1 amp output.