Qi charging losses are around 20% in the best case scenario. This is pretty dumb for a portable battery pack imo, since you'll only be able to effectively use 80% of the pack's capacity.

Bring back replaceable batteries already. Nobody likes carrying around an external battery bank when their internal battery starts to lose capacity after a year.

Also discussed here (102 comments):

https://news.ycombinator.com/item?id=27823869.

What are the losses for wireless charging? I'm surprised to see it in a battery pack.