I was there a year after...

A socket was dropped (not a battery). It was a 5 lb socket, about the
size of a softball. It fell approximately 8 stories. It bounced off
the wall and ricocheted into the missile near the bottom. It punctured
a tank (quarter inch steel) full of extremely toxic liquid. As the
liquid escaped, the structural integrity of the entire missile slowly
deteriorated. When the lower tank (the punctured one) finally
collapsed, the fall released the oxidizer, creating a hypergolic
ignition of all the fuel, all at once.

Kaboom.

The warhead was found (intact) in a field about a mile away.

Many procedures changed, including installing safety "nets" whenever
workmen were working.

Indyrose


You're working in your Titan II missile silo and you drop the battery

http://asms.k12.ar.us/armem/ha/ACCIDENT.HTM