Having a great battery problem with my LG Nexus 5

Hi. I am very fond of using my LG Nexus 5. With all the great features, I can say that, it is probably the best for me. Everything is present in this phone. However, it is pack with 2300mAh battery which drains easily compared to other top-of-the-line Smartphone. I want to know if I can purchase or if there's any other alternative method where I can extend the battery life of my phone. Can anyone help me? Regards.
