Great Power Bank!

I'm assuming the reviewer who complained about it taking a long time to charge was trying to use a phone charger. For the capacity, this thing charges surprisingly fast, if you use a charger that's up to the task. In general, you'll want a USB-C charger rated at 45W. (Same as what this power bank is rated, easy!). One rated for more won't hurt, but it won't help either. Specifically, if you want this thing to charge up as fast as possible, it takes a charger than can output 2A or more, at 20V. I base this on having plugged mine into a charger capable of delivering 87W and using a USB-C power meter seeing that it was operating at 20V and drawing just under 2A. Yes, that's just 40W, not the 45W I recommended earlier. It doesn't hut to have a little margin of error, and since there's a label on the battery bank itself that says "CERTIFIED USB CHARGER 45W", and there's a label under the USB-C port that says 45W, it's way easier to just say, "Use a wall charger that matches the rating on the battery."