Cut the chickens into serving pieces.
In small bowl combine thawed lemonade concentrate, soy sauce, seasoned , salt, celery salt, and garlic powder.
Stir mixture to blend well.
Dip chicken pieces in lemonade mixture.
Place chicken, bone side down, over medium-hot coals.
Grill about 25 minutes.
Turn, bone side up, and grill till done, 15 to 20 minutes more.
Brush chicken with lemonade mixture frequently last 10 minutes