Bests & Worsts Reviews from Amazon

I didn't have any problems using the batteries in some lavalier mics, but I was shocked to one day see what looked like black powder all over the desk at my office. Further investigation showed the black material had come from my bulk pack of batteries and inside the open package there were two batteries burst completely open. My office mate said she had one day heard a loud bang, like a gunshot or the window cracking. Nope, just these batteries. I threw out the entire batch as a result. Not worth the risk.