(Amyet battery, reliable company) 48v 20ah only been used for about a year so basically still new and no scratches or visible damage to the battery. Comes with a key to lock the battery on a bike or whatever and comes with charger max voltage 54.5 4 pins. This is perfect if your looking for extra range or building an ebike and looking for a way to get a quality battery used speed with this battery alone would probably be around 28-35 mph depending on weight of the bike. Price has wiggle room.