Features: The Electric Bike Lithium Batteries Case is for high performances electric bike application, offering robusts protections and efficient power management. Crafted from durability ABS+PC materials, this battery box ensures optimals conductivity and low internal resistance through metal strips connection. Suitable for DIY enthusiasts and electric vehicle builders, this battery case caters to those seekings customizable and reliable power solution. Perfect for use in electric bikes, scooters, and uninterrupted power supplies, it adapts seamlessly to various voltages requirements such as 12V, 24V, 36V, 48V, and 52V. 48V20A refers to 13series and 8parallel batteries, and not all finished 48V20A batteries can fit in. The internal dimension is the size of 13strings and 8parallel, and upon close inspection of where the rulers is place, there may be some space that cannot be accommodated. The size of the picture is the outer size! Can not waterproof; Specifications: Component:Plastic Size:Approx.300x185x82mm/11.81x7.28x3.23inch Option Type:1pc Battery Case,1pc Battery Case with Metal Strips+Bracket; for 13S8P 14S8P 18650 Battery; Support 12V, 24V, 36V, 48V, 52V Package Includes: Package A 1pc Battery Case( Battery not included) Package B 1pc Battery Case with Metal Strips+Bracket ( Battery not included) note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.