Couldn't find any numbers for battery life comparison between original and postmarketOS. Could you share your experience please? (Your last line seems to indicate there might be a significant increase)
I haven't used Postmarket because no software can fix the battery issues with that phone.
If I could easily swap out the battery and also install Postmarket, I would do both. As of now, I can't get a new battery and will therefore do neither.
Have you looked into a DIY battery replacement?[1] I've replaced "non removable" batteries and cracked screens in several phones over the years (the latest being a Nexus 5X) and it's definitely doable if you have a steady hand, patience, and the right tools.
