If all items of the system have no damage, the answer is yes. The charger is UL listed and turns off when the battery is full. The charger and charging port are both waterproof to grade 5 (IPX5) or higher. The charger cycles the battery to 80% in 2.5 hours, and the remaining 20% charges at a lower amperage to reduce the risk of damaging or wearing out the battery. Be smart and safe; if your dog chewed the cord or your robotic vacuum is operating, it is probably not advisable to have your Express plugged in.