Compatible with all DongCheng 20V Max Lithium-Ion family of power tools. Advanced chip design, consolidated housing and inner structure provides durability. Fade-free battery cells with 4.0Ah high capacity of runtime offers long-lasting performance. Over temperature and over-current sensor protects and prolongs the total lifespan of batteries. 4-LED Fuel Gauge of DongCheng battery allows immediate feedback on state of charge. DongCheng 20V MAX 4.0Ah high capacity lithium-ion battery pack has lightweight and compact design with robust and rugged body. Fast charging within 60 Minutes when Using DongCheng FFCL20-04 charger. Powered by the DongCheng 20V Max Lithium-Ion battery platform. Easily share batteries across the entire DongCheng 20V Max family of power tools including: drills, rotary hammers, circular saws, reciprocating saws, jigs saws, angle grinders and more.