Stranded on a deserted island

[johnb]

If you have an infinite supply of batteries, you could build a ship or a bridge with them.
If they are regularly supplied by ship or aircraft, well... there you go. All sorts of options there.

Either way, I'll take #1.

UNLESS choice #3 also comes with the infinite supply of batteries.

That choice offers me the option of making Miss Hewett do all the unpleasant work while I engineer the solution... by hand... in the sand. Ain't it grand?