Using your Makita 18V LXT Starter Pack is easy. First, charge the 18V LXT 4.0Ah batteries using the included charger. It takes about 90 minutes to fully charge. You can check the battery charge level using the L.E.D. indicator on the battery. When using the angle grinder, make sure to install the X - LOCK diamond blade properly. The X - LOCK system allows for quick blade changes. Use the grinder on hard materials like ceramic, granite, porcelain, tile, and stone. The free inflator can be used to inflate things as needed. For maintenance, keep the battery in a cool, dry place. Avoid over - discharging or overheating the battery. Clean the tools regularly to keep them in good condition. Remember, this pack is only compatible with Star Protection tools. And it comes with a 3 - year limited warranty, so if you have any issues, you're covered.