There are a series of tips in the article as well; and this one best sums up the sentiment of the article:
Set email to "push", or at the time frequency that works best for you. Automatically receiving email is a feature. Don’t disable it for a few percent of battery power
The post points out that for the sake of an external charger and regularly topping: up our device we shouldn't sacrifice functionality. It's a refreshing point of view, and one that I've found myself subscribing to as I've been using phones with non-replaceable batteries, such as the Nokia Lumia 800, which never leaves home without the Nokia DC-16 charger to keep it going through a day.
External chargers have the inconvenience of carrying another device which is tethered to your smartphone with a cable. However, carry ing spare batteries require you to take your phone apart and have it turned off which you make the switch.
Which method do you prefer?
'Daisy chaining' the DC-16 with a Lumia 800