Hi all,

I have a small project that uses a couple of coin cell battery holders:
http://uk.farnell.com/keystone/3003/retainer-coin-cell-20mm-pk5/dp/908654

The negative contact is provided by a pad about a third the area of the=20
battery on the PCB.
Space is quite tight, so I was thinking about running some traces=20
underneath the battery near the negative contact.
My worry is about the solder mask breaking down and shorting the traces=20
to the underside of the battery, especially with repeated battery=20
changes (although this should be infrequent, perhaps once every six months)
I will probably just fiddle about and find a way to route around, but I=20
would like to hear any thoughts as to whether this would be "safe" to=20
do, and how resistant solder mask generally is.
Thanks.

--=20
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