Yes...different chemistry than the LiPo….those are Nimh: The case is metal, the thin plastic is only a covering.
"NiMH are generally safe when punctured. Short-circuiting NiMH batteries can lead to rapid heating, which can result in melting and breaching of the case. Once the case is breached, the negative electrode, which is a metal-hydride (i.e. hydrogen-rich) will tend to burn. However, LiIon typically fair much worse under the same abuse. The biggest danger with NiMH is overcharging. At elevated voltages, the negative electrode evolves hydrogen. Heat is also generated during charging, and as the heat and voltage increases, so to do side reactions that produce oxygen, so you end up with cells that are pressurized and contain an explosive atmosphere. If a cell vents, you’ll almost certainly have an explosion. If it doesn’t vent, the cell will breach and then explode."
