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Best 2021 brand new model. You will be very happy with this case, since it is desgined a lot better than previouse versions with much better material!This is the Hailong G56 battery case (comes unassembled) for advanced DIY battery builders. Features: *Its exterior dimensions is 36*9.3*9.0cm (14.1*3.7*3.5 inches) *56 pcs 18650 cell battery holder for a maximum of 13s4p 48v battery *On/Off switch *DC charging port *Battery indicator is for 48V and 52V, but case can work for 24V, 36V, 48V, and 52V batteries. *Lock with two keys Note: This case works for many brands of 18650 cells, such as Tesla, LG, Sony, Panasonic cells. BMS is not included in this kit. You may also check out our ebay store for other items such as nickel strips and BMS that you may need. Can search "Hailong ebike battery case" on Youtube. Many videos with instructions are available to learn how to build a functional battery, using this case. Please make sure you know how to construct the battery before bidding. Instructions can be found from last picture on this ebay list. But it just needs a bit of patience, for most people. We packed parts for individual functional unit into each separated bag, and there is only one place for each part to go. We also have assembled cases in our store which cost another $2.5 for the time we put on assembling, if you would like to try out.