Featured with multiple circuit protection, the power bank case is safe to use. Battery case is detachable and repeatable to replace the battery, fast charging, durable, for home, office, public places, travel charging. It is constructed of aluminum alloy material. The length of this product is 9.1cm, the width is 7.8cm and the height is 2.2cm. The power bank case is suitable for most devices. It features with no welding, built-in rechargeable battery protection IC, charge and discharge protection, solid. Item Name: Battery Case Material: Aluminum Alloy Interface: USB/TYPE-C (Does Not Support PD) Battery Type: Rechargeable Battery (18650 Battery) Applicable Type: Universal Power Capacity: 4 Free-soldering Mobile Power Boxes (Excluding Batteries) Conversion Rate: 85 Percent Protection Function: Anti-reverse Connection, Anti-series Connection, 18650 Battery Charging, Repair Function Motherboard: Multi-channel Independent IC Management Protection Board Output: 5V2.4A Input: 5V2.1A Battery Capacity: 2000mAh-12000MAh Features: Welding-free, Detachable, Universal Size Details: L: 9.1cm/3.58" (Approx.) W: 7.8cm/3.07" (Approx.) H: 2.2cm/0.87" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Battery Requirements: Flat head no protective plate 18650 battery (65MM length), do not use the disassembled battery that has been placed for a long time and has been used many times. Using the disassembled battery will affect the experience. The motherboard is equipped with an anti-reverse chip, which will not burn the motherboard, but because the spring shrapnel is integrated, the battery is broken, the battery is short-circuited, one positive and one negative, the series connection will cause the spring to burn, but after the correct installation, the motherboard can always be normal use, will not burn. Reminder: The product only includes the motherboard and the shell, no battery, and no charging cable. Package Includes: 1 x Battery Case(Others Not Included)