Compatibility:The Adapter is compatible with Makita 18V Li-ion Battery Safety:this converter have added and equipped a fuse, which can increase the safety of the product. Easy to Install: move the adapter into the groove of the battery to fix and lock it in place. Please remove it when not in use. Including:The battery adapter comes with Wire Harness Connector, with a fuse holder and three 40A fuses, screws.12AWG Wire with 40A Fuse Important Note: This adapter is not a charger, it only outputs the voltage and power directly from your battery. If you don't use it for a long time, please be sure to remove the battery from the adapter