If the connector base is yellow with a STAR (with or without a STAR) or black with a STAR the tool will run on the new 5.0 Ah battery. Tools with a black connector that does not have a STAR will not run with the new battery. Feel free to contact me if you have any questions or would like to see more photos. The item "New Two (2) Makita BL1850B 18V LXT Li-Ion Battery 5.0Ah with Fuel Gauge One pair" is in sale since Wednesday, May 30, 2018. This item is in the category "Home & Garden\Tools & Workshop Equipment\Power Tools\Batteries & Chargers".The seller is "qtas_store" and is located in Ringwood, Illinois. This item can be shipped to United States, Canada.