fubar
Ancient and opiniated inhaler
My understanding of "user replaceable battery" in consumer electronics is a battery that is easily installed/removed by the consumer, can be easily done with no experience, and can be done non- invasively (meaning either you don't need to take the unit apart, or if you do, it doesn't void the warranty.
The solo doesn't really it those.
It's not as hard to change as say the omicron v1.1, but I wouldn't consider it "user replaceable" from a consumer electronics context
Definitely not user replaceable like a flashlight battery, but it should work well for maybe 1000 cycles - that's about 3 years if you charge every day.
Not bad for a consumer gadget and definitely not soldered to the circuit board like some.
OTOH it's a beautifully engineered object, designed to easily disassemble and more importantly, reassemble if you're into pulling things apart like me.
Sliding the cover off for the first time made me appreciate how precise the aluminium machining is.
I'd say the battery could be safely replaced by most experienced hobbyists so battery changeover services will probably become available in time...