We are well aware what they are but thank you for the visual prompt. We are not sure if we will be getting the complete setups or just the replacement battery cover and possibly the stock case and allow user to pick up their own battery packs from the local best buy or walmart, they are just USB battery packs that are commonly available right now. I personally would have a longer cable as well, so if sitting outside in a calling blind, you could keep the battery inside your coat and keep it warm, maximizing battery life.