The ARRL has a book called Emergency Power for Radio Communications.
What does the community think?
I'd be inclined to say that if they clearly have a radio connotation (e.g. "what kind of battery pack(s) do I need to run my XYZ rig for at least a day"), they're fine.
More general power questions (e.g. "how many watts can I expect to get out of XYZ solar panel in cloudy conditions") are probably off-topic.
Batteries are an integral part of any portable station, so radio related battery questions have a place.
But the question needs to be focussed: IMHO Battery capacity vs. weight for portable transceivers is not a good question and will lead to opinion-based answers as there is no definitive one.