Bests & Worsts Reviews from Amazon

May 2nd, 2021 UPDATE: I've changed my review to 4 stars because of a feature I didn't notice before. On the product description page one of the images states to hold the power button down until the last digit flashes consecutively. This enters the power bank into a low power charge mode, allowing me to charge items like bluetooth headsets (I have multiple) and my FitBit. Other power banks cut off around 100-200mA, but this feature is actually awesome, and considering they are on sale, I'm gonna buy another 2 pack. I recently ran a number of power banks and 26650 cells thru 2 different capacity and/or load testers. To my surprise, the 1st two items I tested came in at just over their stated capacity (as they should). However, this Getihu power bank did NOT. After charged to 100% capacity and tested at 5v, 2.4A load (12W), this power bank produced 6,214mAh (keep in mind that is at 5v). Capacities are generally stated based on the cell's voltage inside (3.7v in this case). So, looking at total POWER, in Watt Hours (Wh) this produced 6,214mAh x 5V = 31.07Wh. The case clearly states 37Wh (or 10,000mAh x 3.7V). So, this product, while priced attractively, it NOT a 10,000mAh capacity power bank. Multiply that loss by the 2 pack and you just got ripped off for about 12Wh of capacity you paid for. The PRO's for this pack do include it's small size, multiple outputs, and USB-C port which is and input/output port. However, I've noticed the USB-C port doesn't want to charge certain items, most likely a power negotiation issue or something. I also was able to verify that the USB-C port can indeed handle 2.4Amp output for extended periods of time. I'm currently running a 2nd test on this power bank with a 1.2Amp load, to see if capacity improves at all with a lower discharge rate.