It blows my mind that people don't just buy new batteries for these. They are CHEAP, under $10 to DIY replace and not very difficult. If you don't feel comfortable following ifixit guide, then any chain shop shouldn't charge more than $50 for the job, it's 15 minutes or less for someone used to doing it.
I have replaced my SE's battery three times, and the screen/front sensors once. The battery is at 100% health as of my latest replacement a couple of weeks ago.
Signal is still my slowest messaging app. It's not some subjective complaint about jank: compared to Telegram and Messages, Signal is much slower to load and share.
