Everyone that can wield a soldering iron should just have a go.
As long as you are carefully around the use of batteries whats the worst that can happen?
Get those broken old PV items ripped apart and start building.
Nothing like the satisfaction of a home built mod or anything for that matter.
Iv'e built all sorts from snow plows, recumbent bikes, model hovercrafts, to wood burning stoves.
I Fix Iphones, Macbooks, Tv's, Straighteners, and anything that's broken I will have a go at.
I've designed and built custom air extraction systems, Custom car audio ( best in country at one time and could talk for hours on this subject) the list is endless.
So much is wasted these days as we live in a "throw away society".