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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?

Battery Socket

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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\$ – Gregory Kornblum Jan 29 '17 at 20:40
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    \$\begingroup\$ That's John the coin battery, who's currently out of the picture. \$\endgroup\$ – Marcus Müller Jan 29 '17 at 20:49
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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.

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  • \$\begingroup\$ My answer was shorter this time \$\endgroup\$ – Gregory Kornblum Jan 29 '17 at 21:19

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