Ah, it was just so unrecognizeable.
Man, that's nuts. I'm lucky so far, and havent had a battery explode yet (had a primary 123 get super hot, but was able to toss it outside to cool down, then discharged it via 5mm LED in the backyard, and tossed it in the trash, in a superglued film canister)
Mag 1D, 2DL, 3DL, 6D hotwire+extension... Fenix E15... Surefire Z2, E1e, 6P, U2 modded with T5 XM-L... Just to name a few
Lucky no one was hurt, would a protected cell have avoided this?
The main take home lesson in this thread is to only charge Li-Ion cells in safe location, and if charging in series--you must use balance tap leads. Another viable strategy is to charge a number of Li-Ion cells in parallel (assumes they are all identical brand/aged cells, voltages close to each other, etc.), but depending on your charger output, that can take a very long time.