Chosen Solution

I had an iPhone 6, upgraded my phone and left it on a shelf, I’d occasionally turn it on to get photos off it and this time I plugged it in and it showed the battery low screen, a while later I checked it and it went totally unresponsive. I’ve tried swapping the board to a different housing, I’ve tried putting different batteries that I know are charged, nothing works. No response at all. Any way to revive this? I really need some of the data off of it.

An experienced microsolderer would probably be able to revive it, since it suffered no injuries it would probably be the charging circuit or some shorted capacitor somewhere.