On Mon, 19 Feb 2018 19:07:06 -0600, wrote:

QUESTION: What are those coin cells? (like the ones used in computers
for the system clock).

The CR2032 coin cells are solid lithium and not rechargeable. (The
MR2032 are rechargeable.

Has anyone ever seen them leak?

The CR2032 type cell does not contain any liquid electrolyte. There's
nothing inside that might leak.
http://802.11junk.com/jeffl/crud/CR2032-disassembled.jpg
The lithium is the clear stuff, which turned white when exposed to
air. The black stuff carbon.

I ask because I
have several old computers that have been sitting around un-used for
years, and I never removed them cells.

The cells are probably dead by now. I have a pile of 10-20 year old
motherboards in the closet. The coin cells haven't leaked. The
previous generation of batteries leaked all over the PCB.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558