Enhance your tool performance with our 18V 4000mAh Cordless Power Tool Replacement Battery, designed to deliver superior power and reliability for all your projects. Professional Design: Engineered with a robust 4000mAh capacity, this high-rate battery provides your tools with more power, significantly boosting your work efficiency. Whether you're tackling heavy-duty tasks or everyday projects, this battery ensures your tools perform at their best. Multi Protection: Safety is our priority. This 18V lithium-ion battery features an intelligent protection chip that offers comprehensive safeguards, including over-voltage, over-current, short circuit, overcharging, over-discharging, and high-temperature protection. These features work together to prolong the battery's lifespan and ensure safe operation. Widely Compatible: Our replacement battery is compatible with a wide range of 18V cordless power tools and chargers. It fits models such as BL1860, BL1860B, BL1850, BL1850B, BL1840, BL1840B, BL1830, BL1830B, BL1820, BL1815, BL1825, BL1835, BL1845, 194205, and 3 LXT 400. This versatility makes it an ideal choice for various toolsets. High Safety: Certified by FCC, ROHS, and CE, this 18V lithium-ion replacement battery guarantees absolute safety for both you and your tools. Trust in a product that meets rigorous safety standards and provides reliable performance. Superior Performance: Constructed from premium lithium-ion cells, this battery offers no memory effect, ensuring safe and efficient operation. With over 1000 charge and discharge cycles, it promises long-lasting performance. The built-in LED indicator light allows you to monitor battery usage at any time, helping you plan your work without interruptions. Choose our 18V 4000mAh Cordless Power Tool Replacement Battery for a powerful, safe, and efficient energy solution that keeps your tools running at peak performance. Perfect for professionals and DIY enthusiasts alike, this battery is a valuable addition to any toolkit.