This tip is not about what habits to change with your phone/device but the maintenance for your device on how and when to charge your battery. This only applies to batteries of type of Lithium Ion. Now with older batteries it was always recommended that you always discharge your battery to reset the "memory" like in nickel metal hydride and NiCads but it is the opposites with Lithium Ion. Like Steve Gibson says
"What lithium-ion batteries want is to stay charged. This allows you to get the most battery life."
Now what kind of devices have a Lithium Ion batteries? The three of the top of my head are iPad, iPhone and the Kindle. I bet there are many more but that ill leave that to you. Another thing to add is that all three devices I mentioned do not have a removable battery which doesn't allow you to buy an extra one. In the end. this leaves you with just one solution. To extend that battery life of your Lithium Ion battery is a good idea to always keep it plugged in when you can.