About this item Function: RYB40DW20 battery adapter converts for Ryobi 40V lithium batteries to for Dewalt 20V max lithium battery, use Compatible for Dewalt 20volt 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 Ryobi 40V lithium batteries(OP4030 OP40401 OP4040A OP1020A ZROP4026 OP40200 OP4060A OP40201 OP40601 OP40501 OP4015 OP4075A OP4050A OP4026A OP4050 etc.), Convert top Use for Dewalt 20V 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 20V tools,much easier to remove than original adapters,fits well and work great. An Adapter Not A Battery: This can compatible with 20V 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).