iPhone 6 - Battery staying power

Hello, I´ve bought a new iPhone 6. This is my first Apple device. Before that I used Samsung Galaxy. Could someone who has iPhone 6 write me, how long does it ´s battery lasts ? Is it normal, that each hour 3% of battery power disappears? During this time I just sent few text messages. During the night 9% (7 hours). That means, that I must charge it every 24 hours and I don´t watch films or listen to music. Just some texting on whatsapp etc. As I said, this is my first device from Apple and I am used, that my Samsung battery lasted for about three days. I will be grateful for every answer. I just need to make sure, that I don´t have a faulty piece. Thank you. Lucie