Using your VIFLY WhoopStor V3 charger is a breeze. First, choose the right power input option (XT60, USB C, or 12V) according to your needs. Connect the battery with the appropriate connector (BT2.0, A30, or PH2.0). Set the charging current as required, and the charger will remember your last setting for next time. When the charging cycle is complete, you'll hear a beep from the buzzer. As for maintenance, keep the charger in a cool and dry place. The built - in fan and big heatsink help with heat dissipation, but don't block them. Avoid over - discharging the battery. And that's all you need to know to get the most out of your charger!