Using this Makita 18V LXT Li - Ion Starter Pack is easy. First, charge the 18V LXT 4.0Ah batteries using the included 18V LXT Charger (DC18SD). It'll take about 90 minutes for a full charge. You can check the battery charge level with the integrated L.E.D. indicator. When using the tools, make sure they are Star Protection - compatible. Just look for the Star Symbol™ or the Yellow Battery Receiver under the tool. For the circular saw (XSS02Z), hold it firmly and guide it through the material you want to cut. The angle grinder (XAG25Z) with the X - LOCK system allows for quick blade changes. When changing the blade, follow the safety instructions in the manual. As for the X - LOCK 5' Continuous Rim Diamond Blade, it's great for cutting hard materials like ceramic and granite. But be careful, as these materials can be tough. For maintenance, keep the batteries in a cool, dry place. Avoid overcharging them. Clean the tools regularly to keep them in good working condition. If you notice any problems like power loss or strange noises, stop using the tool immediately and check for issues. And remember, this pack comes with a 3 - year limited warranty, so if you have any major problems, contact Makita support.