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you could add something like a 1/2 AA Lithium (Lithium Thionyl Chloride or similar) battery
Interesting, thanks, never heard of this chemistry and form factor. In some datasheet it says "open-circuit voltage of 3.67 V and an operating voltage of 3.60 V" Do you connect it directly to VDD or use LDO or diode or something? nrf52832 specfications says Flexible power management 1.7 V–3.6 V supply voltage range
fanoush
If you're after Bluetooth then MDBT42Q is the smallest you can get, but as @Robin says, the Pico is smaller in some ways (but has USB, not Bluetooth).
If you're going non-rechargeable you could add something like a 1/2 AA Lithium (Lithium Thionyl Chloride or similar) battery - those have 1000mAh+ so should realistically last you a good 5 years for normal applications. The AA size ones can be 3600mAh or so, so would last you far longer.
Yes, there are even two 2mm spaced pins specifically for it - there's a small amount of info on that here: http://www.espruino.com/MDBT42Q#breakout-board
You'd need a LiPo charger board (your second link), but yes, you'd just wire it to V+/GND and you're sorted. Don't connect USB voltage directly as that'll overcharge the LiPo battery and could be quite dangerous :)