I have some also with small dents and dings. I would be very carefull charging them. Watch them as you are charging , also put them in or on a fire proof substance like pottery or concrete. Have nothing that will burn within 3-4 feet of them so if they go off they will not catch anything on fire. Also store them in a fireproof container like a BBQ grill or something similar outside . Or you couldjust go the safe route and kiss them off. Your choice, but remember they are capable of burning you house down, thats a proven fact!!!!!!!!!!!!!
Be Carefull
Bob