Features: Maximize your power tool performances with this high capacity 21700 lithium batteries shell set, offering extended lifespans and customizable assembly for superior energy density in demanding applications. Featuring a PCB protections circuit board that safeguards against overcharge, over discharge, and short circuits, and crafted from durability ABS and metal materials for enhanced thermal stability and shock resistance. Ideal for enthusiasts with basic skills who need to repair or build customs batteries for ,Zhipu,Hongsong,Jingmi,Lomvum Power Tool, ensuring power solution. Perfect for scenario such as refurbishing old batteries or creating new power sources in workshops, home projects, or professional settings with electric tools requiring reliability energy. This cost effective battery repair set delivers easy installation and versatile compatibility, providing a secure and efficient way to maintain your devices for long term use. Specifications: Component: ABS, PCB, metal Size: Approx.13.4x8.2x7.3cm/5.28x3.23x2.87inch Color: black and red for ,Zhipu,Hongsong,Jingmi,Lomvum Power Tool; Applicable battery: for 10cell 21700 battery (battery is not included) Applicable scenario:Power tool repair and upgrade ,Robot project Package Includes: 1set Battery Case(with Screw &Accessories) 1pc Protections Circuit Board note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.