General description This model is a solderless mobile power supply (circuit board + shell) designed for DIY power bank projects. It does not include batteries; customers need to purchase 18650 (flat head) batteries separately for use. The power bank case is available in white and is made of durable plastic. Technical specifications Battery model: 18650 (not included) Installable cells: 6 sections Size: 146 x 77 x 23 mm Color: White Material: Plastic Package Contents: 2 x Power Bank Case Measurement allowed error: +/- 1-3 cm Usage To use the power bank, ensure that the batteries are installed correctly. The positive pole should be placed where the motherboard is located, and the spring indicates the negative pole. Incorrect installation may damage the motherboard, and the shell cannot be disassembled twice, so repairs should be done carefully on the first attempt.