Might be important if you have to frequently recharge through the day. I plug my iPhone 5 in at night, and using an iPad charger it is 100% very quickly. If I have bluetooth off I charge it every other day. With bluetooth on all day I still have between 25% and 50% power at the end of each day.
Also - and I cannot speak to Android devices on this matter - but an iPhone reaches “100%”, it actually is NOT 100% charged. Indeed, for the last couple of % and beyond the indicated 100%, the battery continues to “trickle charge” up to the maximum capacity of the battery (which decreases with every charge).