About this item Function: MT40MT18 battery adapter converts for Makita 40V lithium batteries to 18v Lxt bl1830 series lithium battery, use Compatible for Makita 18 volt cordless power tools. Fully utilize various high-capacity batteries for longer and more convenient use of Cordless power tool,relax outdoor and indoor working anytime. Superior Compatibility: This battery adapter convert buttom compatible with Makita 40V lithium batteries(BL4040, BL4025, BL4045, BL4045F etc.), Convert top Use for Makita 18V cordless drill,Impact Driver,Brushless, chain saws, lights, blowers tools and other outdoor tool. Safe & Reliable: convert adapter built-in voltage protection chip, comply with FCC RoHS and CE security testing standards, made of high quality ABS plastic, safe and durable. Easy to Install: This adapter is designed to compatible with 18V tools,much easier to remove than original adapters,fits well and work great. An Adapter Not A Battery: This can compatible with 18V battery adapter, Converter can't be used for power tool battery charging, this adapter will not fit into any chargers.(Please remove the adapter before charging battery).