IF it goes BANG in a closed room, you would NOT try another battery.
Your eyes will be damaged by acid, your skin will be hurt by acid, your cloth be full with acid, and do not ask how the room would look like.
Ah, and still the floor would be covered with acid.
And then, there's the effect of the explosion itself.
Do yourself a favour, this IS a dangerous thing. Just believe me. I deal and do a lot with old cars, and I have seen a DS exploding under the bonnet. My chum did not look very happy when we put him under the cold water outlet for half an hour.
Carsten