Always love to read about someone trying to fix their malfunctioning product over chucking it in the bin
. Double love it when they can fix it and keep using it
My first Kindle was a K3 I bought last year that I had to replace the battery as it was a similar problem to yours. It's always a little daunting trying to fix something yourself even after looking at how to vids and repair articles but it made me feel good that I could fix it.