I try to avoid devices with built in batteries. Could a version be created that uses a replaceable 18350, 18650 or even AA? I'm OK swapping every few months etc, but when its time to dispose of it, I don't want to fret about how to remove the battery for recycling.
Totally fair, I feel the same way. Originally Photon was going to use AAs but I changed course when I decided I wanted to make it water resistant.
(FWIW Photon uses a 103040 which is pretty commonly available, the only caveat is it needs a Molex Pico-EZmate connector, which is a super-low-profile connector since interior space is scarce.)
Is the battery soldered? Is it a fairly standard kind of thing like an 18650 (obviously not the same size, but I'm not familiar with what "standard" pouch style batteries exist)?
It’s not soldered, but it does have a Molex Pico-EZmate connector (chosen for its low profile), and I’m not sure you can find batteries premade with that kind of connector. You could reuse the existing connector with a new battery, but that would ideally involve soldering.