[vineyardmike]

The portable battery pack is no more bulky than carrying around portable phone batteries?

And it has the benefit of being sharable.

And it has the benefit of being able to work hot - you don’t have to turn off your phone to charge it.

[JohnFen]

> The portable battery pack is no more bulky than carrying around portable phone batteries

They're a lot bulkier. Phone batteries are physically very small and light. Good power banks aren't.

[jenadine]

Power banks come in different sizes. The bigger ones also allow to recharge your phone several times. There are also small and light ones that contains energy for one full charge or less.