I searched a lot on the internet for any small holder. The smallest I could find was holder for CR1220.
Does such battery and holder sizes even exist?
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\$\begingroup\$ I don't think it's a place for a holder. It's for leads connected to the battery. jameco.com/z/… \$\endgroup\$– user76844Jan 29, 2017 at 20:40
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1\$\begingroup\$ That's John the coin battery, who's currently out of the picture. \$\endgroup\$– Marcus MüllerJan 29, 2017 at 20:49
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1 Answer
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That footprint is not for a holder. It looks like it's meant for a coin cell with solderable leads. From the "RTC" and the watch crystal, it looks like the battery is for keeping a low power clock running when 5 V isn't supplied on the IIC interface.
I'll guess that a 3 V battery would work fine. Look around on the a distributor site like Mouser for the largest capacity 3 V leaded coin cell you can find that fits mechanically. You have considerable leeway for the cell diameter, up to just under 10 mm maximum. 8 mm looks like it would be a comfortable fit.
Panasonic is one supplier of such batteries. They are not hard to find.
answered Jan 29, 2017 at 21:01
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\$\begingroup\$ My answer was shorter this time \$\endgroup\$– user76844Jan 29, 2017 at 21:19