Certainly does, and thanks for bringing that up (a fact I just took for granite and thus failed to mention). I personally charge my Li-Poly RC type packs in the shop on the concrete floor, and I don't use high Amp fast chargers but rather charge at a lower, slower, safer rate. Idea being the concrete floor makes a great heat sink to potentially prevent a problem from starting in the first place by keeping the packs cooler while charging and also if a fire does start that it where it is least likely to spread. In-fact I do that for all my non-LiFePO4 chemistry lithium batteries. LiFePO4 is very stable and almost idiot proof (nothing no matter how benign is ever completely idiot proof) so I don't even bother taking any precautions with them and charge them right on the hard-wood kitchen table and sleep peacefully doing so.