Traxxas 2889X - Power Cell 4S 14.8V LiPo Battery, 25C 5000mAh, iD Connector - This is a used battery of unknown age. It is either a customer return or pre-owned, and has been sitting for quite a while on the shelf. It has been tested to make sure the cells are balanced, and that it charges on a Traxxas iD charger. Please do not expect that it will look or function as good as a new battery; it is a used discount battery.