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Board does not work when powered by coin cell battery

My nRF52 DK has PCA10040 V1.1.0 2016.34 682272915 on a label.

It works fine when connected to my laptop over USB. If I try to power it from the coin battery underneath though, there's no sign of life. The LED does not light and I can no longer detect its Bluetooth advertising. I have to conclude it has not powered up. I've checked the battery with a multimeter and it's showing 2.78V. I've tried another battery.

Do I need to change a jumper or something? I couldn't find any information that suggests using a battery to provide power requires any kind of special action.

Thanks

Martin

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