MT20RNL battery adapter for 18V battery, converts to Roybi 18V, converts to 18V battery

Compatibility: Compatible with P102, P103, P104, P105, P107, P108, and P109 and suitable for 18V cordless power tools. (Note: Not suitable for P551 cordless saw, 18V radio, or lamp, e.g., P742 and P746).
Advantage: This adapter allows the use of the listed lithium batteries for 18V tools, enabling you to enjoy the extended runtime benefits of lithium-ion batteries on existing 18V tools.
Application: Can use 18V lithium batteries and backup batteries in most battery packs: BL1860B / BL1860 / BL1850B / BL1850 / BL1840 / BL1830B / BL1830 / BL1820 / BL1815, etc.
Caution: It cannot be used for charging The power tool battery is not connected to a charger, and the adapter cannot be plugged into a standard charger. If you need to charge the power supply, use your old battery charger.