I don't know about chemicals in batteries, but Ti is pretty darn resistant to most things.
However, Ti isn't a great flashlight material for a number of reasons.
Instead of carbon-zinc, I'd look at lithium powered lights for long term storage. They have a shelf life of about ten years, are resistaint to cold.
For example, the Surefire G2 is a great deal for a very tough, bright little light.
There are also some great, low (ish) cost LED lights like this light that supports two levels, or this or this one cell light.
And the lithium cells can be had for around $1 ea. online.
-john
You do not have to convince me, I have been a member of
www.candlepowerforums.com for a long time, and I have a QIII already... But I AM glad you posted that link, because they ahave the hard shell battery cases that
www.countycomm.com are out of!!!
I also have been buying Surfire flashlight since before most people had heard of them... My first was the old 3 cell BLACK one with the round head...I even have the turbo head for it...
Also a E2D...
Also a 6 cell
and the weird looking one that can only be used for a min. before the thermal shutdown occurs, but MAN is it bright!!!
All told, somewere around $1000.00 of just Surfires!!!