RE: wanna see the inside of a lipo?
A while ago I picked up the Ni-Mh pack from my stryker and was holding it in my hand walking back, and suddenly I felt my finger getting burnt from the battery. Luckily it wasn't serious, but I realized when I looked at the battery that it had short circuted and burnt through the cover! It was pretty cooked around where it had burnt through, and so was my finger where it got burned, which looked all black and brown before I washed it off. I'm guessing that during the crash, the batteries leads had pulled out and caught each other for a moment. Then when I picked it up I managed not to notice it since it was on the bottom. Always be careful with all batteries!
On the plus side, that same battery had (earlier) decided to "eject" from an older plane in a death spiral at about 50', hit the ground, bounced, and was still useable. Even one of the batteries I'm using now has fallen out of the plane in midair, due to a faulty battery hatch, and still is perfectly fine!