Using the Makita DC4001 charger is a breeze. First, connect it to the Makita PDC1200 ConnectX™ 1,200Wh Portable Backpack Power Supply. Then, plug it into a suitable AC power source. The charger will start working right away, charging the power supply and giving your Makita 36V Connect X tools more run time. When using the charger, make sure it's in a well - ventilated area so the built - in fan can do its job properly. Avoid using it in extremely hot or cold environments as this may affect its performance. For maintenance, keep the charger clean. You can use a dry cloth to wipe it down. Check the power cord regularly for any signs of damage. If you notice any issues, stop using the charger immediately and contact Makita support.