I walked into my house early this week to the smell of burning. I couldn't find where it was coming from. Last night as I was gathering my laundry I noticed a burn through the back of my jeans. A HUGE hole. I had a spare Touch Pro battery in my back pocket. It had expanded and obviously started a fire in my jeans. They were in a clothes pile and buried, so I assume that there wasn't enough oxygen to start a fire. I will post pictures later, but be very careful where you store extra batteries. I was very worried about my home.