It can fill 15 pieces of 21700 power Li-ion batteries. But this is plastic shell, there is no battery no PCB inside. It is used to repair and assemble batteries pack, only for people who are familiar with battery performance and have practical experience in battery assembly. DCB609 15 Cells 21700 Lithium Battery Plastics Case For DeWalt 20V 60V Li-ion Battery No Original, , No Battery Cell !!! No PCB !!! DIY (semi-manufactured goods, No battery! No PCB! ) Advance notification: (1). To use this product, you need to have some professional knowledge and experience. We do not guarantee that you can use it well. (2). It requires you to have specialized assembly tools. If you do not have these tools, please do not place an order! (3). The nickel may not be exactly the same as shown in the following picture and may change with the batch. Please do not mind! Do not purchase if you mind. Purchase Notes: 1. This battery case is only suitable for 21700 power cells! 2. We only provide the casing, not the battery cells and circuit board! 3. We are non original products, and we cannot guarantee that our casing will be 100% compatible with your circuit board! Please purchase with caution! 4. Please carefully check if our casing matches your circuit board before purchasing. Color: Yellow & Black Material: plastic Package Contents: 1 x Li-ion Battery Case