Hi guys, Just want to ask what you guys think is more worth it to buy from wholesale power bank or extra battery? Extra battery for Note or a power bank. How about Extra Battery: 1. Open and close of back cover. More annoying when you have an external casing. 2. Requires one by one charging of batteries. 3. Only for Galaxy Note. How about Power Bank: 1. Universal power bank. For future use once new phone. 2. Simultaneous charging. 3. Will charge phone and will take time. Not ready ASAP. Which one will you guys choose?