Personally I wouldn't put solder mask in the area that the battery lives, t=
o ensure that the pad contact surface is that few thou clear of the fibregl=
ass, but that is not what the OP is wanting ...



> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf =
Of Joe
> Wronski
> Sent: 13 October 2011 16:15
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Solder mask strength for traces underneath battery
>=20
> Use teflon tape under battery holder at assembly time?
> Joe W
>=20
> On 10/13/2011 9:32 AM, Oli Glaser wrote:
> > 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/9086=
54
> >
> > The negative contact is provided by a pad about a third the area of the
> > battery on the PCB.
> > Space is quite tight, so I was thinking about running some traces
> > underneath the battery near the negative contact.
> > My worry is about the solder mask breaking down and shorting the traces
> > to the underside of the battery, especially with repeated battery
> > changes (although this should be infrequent, perhaps once every six mon=
ths)
> > I will probably just fiddle about and find a way to route around, but I
> > would like to hear any thoughts as to whether this would be "safe" to
> > do, and how resistant solder mask generally is.
> > Thanks.
> >
>=20
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