BBQ chicken can safely be kept in the refrigerator for up to 5 days and by then it can go bad and should be thrown out after 5 days.
You can however keep BBQ chicken for up to 6 months in the freezer since the freezing temperatures in a freezer will keep bacteria from forming on the BBQ chicken.
So if you want to keep your BBQ chicken safe to eat for later then store it in the freezer to keep it safer and make it last longer.
Then after you freeze it and are ready to eat the BBQ chicken you can then put it in the OVEN to heat the BBQ chicken back up after it thaws out.