ROMOSS Sense 8+ 30000mAh 18W Fast Charge Type-C PD Portable Power Bank EXPIRED

Something to keep in mind for those who would take this flying, it has 111WH printed on the battery which is more than the 100wh limit for carry on before you are technically supposed to get airline approval for. Of course YMMV on whether TSA will actually check closely, but potentially more hassle to bring something this large when flying.

That's true for most of these battery packs. I'd like to know by what metric though. Did they actually open it up to see the capacity of the cells they use? If so, that would be misleading and false advertising. However, if they simply tried to charge their device and got less total energy than expected, that is not necessarily false advertising since all battery packs lose some energy in the charging process.

EDIT:

I just read one of the critical reviews. I've pasted it below for reference. The problem is they are not taking into account the actual energy capacity of the battery. They are simply assuming mAh can be converted between his MacBook and the battery pack and the iPad which is incorrect. The batteries in the MacBook are 3S which means they have a nominal voltage of something like 11V while these battery packs are 3.6-3.7v. So at least for this one, it is simply the user thinking they're smarter than they are. I mean, does he really think a $35 battery pack that is the size of two smartphones will be able to charge his laptop 7 times?? He must be lying when he claims he has a 20k mAh battery that can charge his macbook pro 4 times. That would break the laws of physics and would also not make sense why laptop manufacturers don't just put bigger batteries in their laptops if they can be so cheap and so small.

I've never seen one that stays on...Aukey, Ravpower, Samsung, etc.

Obviously the real issue is your phone. I don't lose more than 1-2% over night on a modern device.