Hello Fishermen, As a fisherman myself, I was tired of carrying big, heavy battery around the boat. Moreover, when you hook up a big fish, there is no way that you fight the fish and carry the battery at the same time. This battery is the one that is small, light weight, super powerful. The battery Capacity 14000mAh( Maxed out) which has enough power to fish all day long. It works perfectly with any Daiwa/Shimano/Banax electric reels. There are 2 USB ports where you can use it as Power Bank to charge your phones