So I've been using Romoss Sense 6P and it's been good so far. It has this indicator where you would know the percentage left on your power bank. It has 20,000 mAh which is really good for heavy users. I prefer using it to charge my phone rather than directly charging my phone in a power outlet. It can charge my phone 3 to 4 times which is really convenient. The downside is that it takes hours to fill up the power bank's battery and it's really quite heavy for a power bank. So that being said, can you suggest other power banks that you think are good as well? Your inputs are highly appreciated. Thank you.