Using the Bosch GXS18V-15N15 Starter Kit is easy. First, insert the CORE18V® 4 Ah battery into your Bosch 18V power tool. Make sure it's properly seated. For charging, connect the battery to the GAL18V-40 charger. The charger will show the battery's status. When using the tool, start with a lower speed for delicate tasks and increase as needed. For standard to medium-duty jobs like drilling into concrete, metal, or wood, or for metal grinding, cutting, and light chipping, this kit is great. Just keep the tool steady and apply even pressure. When it comes to maintenance, keep the battery and charger clean. Avoid exposing them to extreme heat or cold. After each use, remove the battery from the tool. If you're not using the battery for a long time, store it at about 50% charge. Bosch 18V chargers have a five-year limited warranty, and the batteries have a three-year limited warranty. Check https://rb-pt.io/PowerToolWarranty or call 1-877-BOSCH99 for details.