KoReader # https://koreader.rocks/ is a Jewel of a document viewer for e-ink devices: it's an e-reader, supports plugins and many formats. I am using it on a Kindle Paperwhite 11th gen (PW5) and on a Kindle 4 (K4). document location # store your koreader documents NOT under /Documents because it increases the battery usage due to the kindle's automatic machanism of indexing the content of that…