Dont just leave it, especially if you are not sure about it. I had a small 1s lipo go bang the other day. It just burst into flames while charging!
Luckily it was put out before it did any damage but went up in a proper fire ball. It was only a 600mah 1s aswell.
Nearly took my mobile phone with it, you can see where it was on the desk. http://i1351.photobucket.com/albums/p791/plymouthrc/LIPO2_zpsvfqiukom.jpg[/IMG] http://i1351.photobucket.com/albums/p791/plymouthrc/LIPO1_zpsacfasz5v.jpg[/IMG]