One of the biggest smartphone bugbears is battery life. They have the potential to act as a satnav, internet search engine, currency concerter, games console and telephone all in one, which would be fantastic...if they held their charge for long enough to make a call! And if recharging the battery didn't take an eternity!
To give your battery a boost when you're running out of time charge it on "airplane mode". The battery life replenishes much faster than when on regular settings, so you'll have twice as much battery in half the charging time!