My iPhone 5 is always within reach of power but today was the first time I used it without being able to charge it.

At 6.30am to 9.30am it got used for web browsing, twitter and RSS feeds. Plus playing Letterpress. 40% of the battery had gone so I put it on airplane mode for 8 hours. I turned it back on for 20 mins during that time to download RSS feeds and twitter posts. At 6pm to 8pm it was used as before but not as heavily. After 8pm the phone went flat.

Would you say this is normal? I love the iPhone 5 but was left a little disappointed.