I just know from expirence that you can never be to confident with Li-Po batts. (this IS a true story) One minute I was typing on my dads laptop, then the next, the battery port was smoking. It had fallen off my lap, and hit the floor, causing the contacts inside the battery to knock together. I quickly ran down stairs and got the fire-extinguiser from my workshop (in the cellar). By the time I got upstairs flames were visable but it was easily put out. If the flames had got a chance to get into the cells then it would have been a case of... Boom
The short-circuit had put to much stress on the battery causing the fire. Cheers, Ewan