[sdiy] Lithium batteries & corrosion (Was: Retaining button state after power off?)

[cheater00 .]

On Fri, Feb 7, 2014 at 12:46 PM, Andre Majorel <aym-htnys at teaser.fr> wrote:
> On 2014-02-03 20:03 -0500, Scott Nordlund wrote:
>
>> I don't know of anything really corrosive that can leak out of
>> a lithium battery. If you puncture one (which probably isn't a
>> good idea for anything larger than a dead CR2032), the solvent
>> (dimethoxyethane) evaporates almost immediately, leaving no
>> liquid to speak of. The rest of it seems to be manganese
>> dioxide, lithium perchlorate and propylene carbonate,
>> according to Wikipedia. I don't think I've ever seen one leak.
>
> Could humidity and the presence of a DC voltage conspire to
> cause galvanic corrosion ? I don't know exactly *how* the
> corrosion happens but I know that it does. :-/

Maybe there was a different battery before, it got swapped, but the
person didn't remove the corrosion from the board?

D.