Re: Longer battery life
Since the article is about Nexus 6, ie we are talking smartphones....
The idea of carrying an extra battery pack defeats the purpose...I wouldn't carry a laptop and 4 extra batteries either... The whole idea is to keep things as light as possible whilst requiring the minimum of gadgets/extras/chargeers/cables etc.... The more you need the more likely that you will forget/lose something.
Which smartphone do you know of that has a full weeks battery life and has a screen size larger than 3.5". And I obviously don't mean a smartphone that will remain unused, doesn't surf the web and doesn't receive email from either 2G/3G or Wifi.
I have had several Samsungs which I like but their batteries are certainely not capable of any more that 2 days without requiring a full charge and that is only with the lightest of usage.