Features: Built in board provides multiple safety protections, effectively preventing overcharging, overdischarging, and short circuit issues, ensuring longer battery service life. Durability ABS with superior shock resistance, capable of maintaining stability in harsh environments. Specially designed for 18650 lithium batteries, compatibility with most similar products in the market, easily achieving power for multiple devices. Suitable for users with multiple electronic devices, simplifying battery management. Quickly assemble without the need for tools, saving users time and improving efficiency. Specifications: Component: ABS plastic, 3S 30Amp board Dimensions: 6.5cm/2.56inch, as pictures shown, fit standard 18650 battery Usage scenarios: Widely used in consumer electronic devices, such as flashlights, power tools, mobile power supplies and more, to provide stable power for devices. Application: For 10.8V 12V screwdriver battery replacement NOTE: 18650 battery not included! Package Includes: 1 Set 18650 Battery Casing with Board note: Other accessories demoed in the pictures is not included. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.