Function: The MT20DL battery adapter is compatible with Makita 18V lithium battery, converted to Dewalt 18V-20V Max lithium battery, perfect replacement for Dewalt 18-20 Volt cordless power tool lithium battery. Compatibility: The top port of the conversion adapter is compatible with Dewalt 18-20 Volt cordless power tools. The bottom port of the conversion adapter is compatible with Makita 18V lithium batteries (BL1815, BL1820, BL1830, BL1830B, BL1840, BL1850, BL1850B, BL1860), etc. Safety: The Echoyee conversion adapter has a built-in voltage protection chip, complies with FCC RoHS and CE safety testing standards, and is made of high-quality ABS plastic, safe and durable. Note: The converter cannot be used to charge power tool batteries, the adapter is only suitable without a charger. Warranty: You will receive 1 MT20DL adapter (without battery) and 1 manual, 1 year warranty! Features: Connection Technology: DC Pen Holder Connector Type: Barrel Connector Compatible Devices: