This battery adapter for Battery to Battery, Convert 18V Battery to 18V Tool Use. Compatible with for One+ 18V tools Series P7131, P340, P208, P236, P601, P135, P515, P505, P731 etc. Convert 18V battery Replace P104 P105 P102 P103 P107 P108 batteries. MT20RNL battery adapter converts for 18v Lithium batteries to 18v One+ Plus Lithium Batteries, use for 18 Volt cordless power tools. Work great as 18v One+ original Lithium Battery, same as the function & compatibility. And lets you enjoy the benefits of extended operating time of lithium-ion batteries on existing 18V tools. Compatible for 18V lithium BL1860B / BL1860 / BL1850B / BL1850 / BL1840 / BL1830B / BL1830 / BL1820 / BL1815 etc. and fit for 18V ONE+ System Cordless Power Tools. This battery adapter built-in high intelligent Protection chips against potential damage caused by over-charging, over-discharging, over-voltage, over-current,short-circuit. fire- construction, complete protection for your home and your devices. Specification: Color: green Material: ABS And High Quality ! Type:Battery Convertor Adapter Model:MT20RNL Rated voltage:18 V Rated current:3 A Compatible FOR 18V CORDLESS PLUG TOOLS. Package Contents: 4 x MT20RNL Battery Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.