Been using this product for a week. Had bought it for my Redmi Note 5Pro which has a battery capacity of 4000 mAh.
Now, things to keep in mind: 1. Most important- Capacity of the battery is 20,000 mAh but actual power is 13000 mAh (As claimed by Mi on the website) due to conversion loss. So technically it should charge my Phone for 3 full cycles, so does it? The answer is YES, which is a big thumbs up from my side. 2. can simultaneously charge 2 devices (just did a casual test, worked fine) 3. Throughout the week I tested it for my phone only using a single port which triggered Qualcomm 3.0 fast charge & it heated my device (Not very much but acceptable). I have attached a screenshot of the quick charging icon visible when phone is connected to a single port on the powerbank 4. Bcoz of the bulky size, putting an external cover for gripping is advisable. I purchased a silicon cover separately for it. 5. Has overcharge & short-circuit protection (Company claimed). 6. Not pocket friendly.
Overall i am happy with the purchase considering the price to performance ratio. Would definitely recommend to anyone who travel or require an external backup source.