I gave my boss a Smoktech Bolt mod, a Trustfire TR001 charger, and three AW 18500 protected batts for Christmas. He's been loving the heck out of it until yesterday. He calls me up and tells me that his batteries have been taking about 8 hours to recharge. Then he says that he put one of the batteries in to recharge and the battery exploded. Destroyed the battery and charger and left a charred spot on the floor.
He's saving the remains for me to look at this weekend.
I'm trying to think of what could have gone wrong and I've only come up with one possibility so far. I noticed once that he always takes his charger with him. I noticed that he carries his spare batts in the charging slots of the charger. My thinking is that if he uplugged the charger with the batteries still in the bays, that the charger drained the batteries. Then when he plugged the charger in at his house, it caused the batteries to fail and detonate.
I've never had any problems with any of my batteries or chargers, but I've never left batteries in an unplugged charger either. I've also never had a battery take 8 hours to charge.