I really like the focused idea. This is likely the best product in its niche. It's an oddly large niche--this is a tool that can solve a lot of problems.
Is the battery replaceable if it fails?
Is the battery replaceable if it fails?
It's replaceable but I hadn't thought that far ahead regarding end-users doing it. The caveats are:
1. I made a special tool to avoid scuffing the aluminum when removing the backplate:
https://toaster.llc/blog/rainproofing
Search for "Backplate Removal"
2. The backplate needs to be re-sealed (with standard RTV sealant).
3. The PCB uses a Molex Pico-EZmate connector. (It could be transferred from the old battery to the new battery, or I could sell pre-made batteries if there was interest.)