I have a pre-production model Darwin. It was packed in a box in a moving truck for a couple of days while I was moving. When I unpacked it the case was separated and the batteries were bloated and felt like they were under tremendous pressure. I opened the unit to let them breath and hopefully return to normal size. After a few hours in a cool house they are still bloated. They were not warm to the touch when I pulled the unit out of its packaging. My question is: are these safe to use? Will they blow up if i put a charger on them? I really want to get back to using my Darwin, but only if it is safe!!!