I just bought the Ego trimmer with the 2.5Ah battery, and I was wondering about the charging process. After I complete a charge, I know the manual recommends removing the battery and unplugging the charger, but I was wondering if I could just unplug the charging base from the wall and leave the battery on it until the next use. Will this drain the battery in any way if no power is going into the battery? Maybe this is a dumb question. I just want to be economical with my battery charging habits.