Hello guys...!!! I have a galaxy nexus phone and I need an extra battery for my phone. Can anyone help me to purchase a battery for me??? I also looked for the ext. battery charger but have no idea about these products. Batteries like Sony CP-ELS Power Bank For Smart Phones | Battery Charger | Flipkart.com and Nokia DC-16 Charger | Battery Charger | Flipkart.com which one is better??