Sure. But what is the maximum possible damage from a burning battery? Even if you managed to burn through a window, that'd be highly unlikely to down a modern airliner.
I've yet to step foot in an airport that didn't have water fountains, and won't let you take an empty reusable bottle through security. There's no need to buy bottled water.
In that case your "small toothpaste" (which is allowed) might not be that either.
And you can always dilute it in your air-hostess delivered water if you're so inclined and you just need to have your poison/whatever in liquid form...
Please, what a frigging joke. Be cooped up in a small bumpy space for hours trying to create a very touchy explosive.
... hydrogen peroxide, acetone, and sulfuric acid ...
put a beaker containing the peroxide / acetone mixture into the ice water bath (Champagne bucket), and start adding the acid, drop by drop, while stirring constantly. Watch the reaction temperature carefully. The mixture will heat, and if it gets too hot, you'll end up with a weak explosive. In fact, if it gets really hot, you'll get a premature explosion possibly sufficient to kill you, but probably no one else.
After a few hours - assuming, by some miracle, that the fumes haven't overcome you or alerted passengers or the flight crew to your activities - you'll have a quantity of TATP with which to carry out your mission. Now all you need to do is dry it for an hour or two.
I never said it was a legitimate threat (in fact, I called it idiotic), just saying that no one was ever worried about poison. You could say they should be worried about poison in the sense that poison attacks seem much easier and much more likely to be effective than explosive attacks, but then again they should be worried about nothing, since terrorism is so rare that it's not worth nearly the amount of attention it gets.
