Speaking of batteries:
Y'all remember the
puffy tablet battery I posted about a week ago, right?
Well the replacement came today, and after installing it and declaring the tablet good-to-go, we decided to disassemble the old, puffed up battery to see exactly what was inside, and then to dispose of it as improperly as possible -- all in the name of science, of course!
Anyway, there were two pouch cells inside, wired in parallel. Still at at near full charge, the raw cell voltage measured 4.30V. So we decided, let's try a hard short on one to see what might occur. Here it is, milliseconds after connecting the shorting device (I'm about to back away to a safe distance):
Much like Marvin the Martian, we were hoping for some kind of kaboom, or at least some minor pyrotechnics. We were disappointed. For minutes later, all we had was a significantly more puffy cell that was quite warm:
After letting it cool just a bit, we decided to stab it with a knife in order to relieve the pressure. That did produce a bit of smoke, but no fire of any kind. Here it is, about to be dropped in a bucket of water:
We also stabed the other one that hadn't been discharged at all. That one produced less smoke. Under water, both bubbled away for a while.
So how to those of you who use LiPos in your DNA mods dispose of your old cells?