Way to go, modern phone screens are not too bad…I think a big reason I enjoy dumb ereaders is the lack of multitasking lol
Your kindle probably has a busted micro usb port (the cables too can stop working for data transfer), no idea if it’s too difficult to solder a new one… I would try cleaning it up really well first
I agree 100%, NiMH cells (the standard for rechargeable AA, AAA, I even have some AAAA for certain tablet styli) have gotten so cheap, they’re sometimes cheaper than alkaline at first use! It’s insane.
If you don’t have a charger I’ve heard good things about the Ikea Stenkol one, cheap (5-12€ depending on country) but should be reliable. Ikea also sells the cells.