I think those are Li-Po (Lithium-Polymer) and of different composition. I fly radio-control and our field does not allow charging the Li-Po batteries on site anymore as we had three fires in two months from two planes and one helicopter bursting into flames on a quick 12v field-charger. The helicopter was sitting inside the open hood of the plastic engine "spat" in the guy's car and did some pretty goods paint & plastic damage to the vehicle on the way out.
Charlie P. P31-2 #80 CATNAP
To travel hopefully is a better thing than to arrive - R.L. Stevenson
I suspect that, if you should go to the end of the world, you would find somebody there going farther . . . - H.D. Thoreau