Function and compatibility This adapter allows 18V cordless power tools to be powered by selected lithium battery packs, enlarging runtime and improving overall performance. Voltage and performance Maximum initial voltage up to 20V with a nominal 18V operation, designed to deliver efficient and reliable tool performance. Battery models supported Compatible with lithium battery models BL1860B, BL1850, and BL1820, making it a versatile addition to your toolkit. Size and storage Lightweight, spacesaving design with approximate dimensions 11 x 5 x 9 cm, easy to store in a workshop or toolbox without clutter. Use scenarios 1) On the job site with drills or impact drivers: use BL1860B, BL1850, or BL1820 to extend runtime when continuous operation is needed. 2) In the workshop during long projects: swap between battery packs to maintain steady tool performance without frequent interruptions. 3) In field service or service calls: adapt to varying battery inventories by powering 18V tools with the available lithium packs, reducing downtime.