Using the DeWalt DCB135C 12V Starter Kit is a breeze. First, take the batteries out of the kit. You can easily insert them into your 12V MAX tools. When you're using the tools, keep an eye on the LED fuel gauge on the battery. If it shows a low charge, it's time to recharge. To charge the batteries, just connect them to the DCB115 charger. The charger can be mounted on the wall using the included thru - hole wall mounts for convenient storage. Make sure to use the charger in a dry and cool place. Avoid exposing the batteries and charger to extreme temperatures or moisture. For maintenance, keep the batteries and charger clean. Wipe them with a dry cloth regularly. Also, if you're not going to use the kit for a long time, store the batteries at a partial charge. This will help keep them in good condition for your next jobsite use.