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@jonreid
Yes I was having a look at those type of cells last night. In my application the sensor/pico/nrf are going to be located inside a fridge and at those temperatures the voltage drops to around 3.2V, so I would probably need to use a couple of smaller cells. The DS18b20 have a min of 3V and the NRF a max of 3.6V hence probably need to use the regulator, unless I protected the NRF at room temperature.
But in principle these look like the right kind of battery to be using.