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@Gordon
Yes, you can just power it from the 3v+GND pins.
However, the maximum rated voltage of all the components is 3.6v so ideally you shouldn't exceed that. With a LiFePo4 battery it looks like you can get up to at least 3.65v when charging?
The 'Absolute Maxiumum' voltage for the nRF52 chip is 3.9v (and the mag/acc/temp sensor are higher) so you probably could run the Puck just fine (especially if the max really was 3.65v), however it's not something I would recommend (and I wouldn't replace one if it broke doing that!).