Currently I have a Galaxy S4 smartphone but due to the fact that the battery is quite awful - lasting around 4-6h with normal usage, I'm thinking about changing to an iPhone, considering I have a Macbook Air. I need a good battery life because I spend almost all of my day outside with not many possibilities to charge it during the day. I'd have two email accounts with push email (gmail and zimbra), Facebook, twitter and tumbrl usage throughout the day, whatsapp and bbm chat, maps or apps using locations, taking few photos, and using various apps - i.e. pininterst, news feed, etc. Do you think any iPhone would have a battery life good enough to last until evening around 9-10pm starting at 8am? And if that is the case, what model - i.e. 5s or 6, should I choose?