Product Description About this item 【Converter bottom】 Compatible with Makita 18v lithium battery.BL1815,BL1815B,BL1820,BL1820B,BL1830,BL1830B,BL1840,BL1840B,BL1850,BL1850B, BL1860,BL1860B,BL1845,BL1890,BL1890B,etc. 【Converter top】Compatible with SKIL 20V Li-ion Battery power tools.BY519702，BY519601,etc. 【WARNING】Make sure that the battery is fully inserted for normal use.Please do not force into the battery pack, if the battery pack can not be installed, the installation method may be wrong 【Note】This product is only compatible with the tools, not compatible with the charger, Do not use the adapter to charge the battery，When you need to charge the battery, remove the converter. Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Manual measurement, please allow 1-10mm error. Thanks for your understanding. WARNING: Make sure that the battery is fully inserted for normal use Please do not force into the battery pack, if the battery pack can not be installed, the installation method may be wrong This product is only compatible with the tools, not compatible with the charger, Do not use the adapter to charge the battery When you need to charge the battery, remove the converter