Using your Makita 18V LXT Starter Pack is a breeze. First, charge the 18V LXT 4.0Ah Batteries using the included charger. It takes about 90 minutes to fully charge. You can easily check the battery charge level with the integrated L.E.D. indicator. For the angle grinder, simply install the X - LOCK 5' Continuous Rim Diamond Blade quickly with the X - LOCK system. When using the grinder, hold it firmly and start slowly to get a good grip on the tool. The recipro saw can be used right away as it's a bare tool. Just insert a charged battery and you're ready to cut. Remember, these tools are only compatible with Star Protection tools, so make sure your other tools have the Star Symbol™ or a Yellow Battery Receiver. When it comes to maintenance, keep the tools clean after each use. Wipe off any dust or debris. For the batteries, store them in a cool, dry place. They resist self - discharge, but it's still a good idea to charge them every few months if they're not in use. And don't forget, this pack comes with a 3 - year limited warranty, so if you have any issues, you're covered.