Brushless motors make an AC signal electronically to rotate the motor. Even simple speed controls use electronic components. Lithium battery packs have protective circuitry to prevent over charging (fire hazard) and over discharging (permanent damage). Good ones are built to withstand a work environment. I would keep it dry and out of dirt but not go nuts. If it is a quality brand:Bosch, Milwaukee, DeWalt, Makita, it is built to take it. Babying it may avoid some scratches but I am not sure it will last that much longer.I didn't know any tools had cards in them. So what are we talking about?