I read both the first and fourth edition. The first is mercifully short, fourth takes you up to date past the lithium revolution. Haven't read intermediate editions.
I don't know of a better primer. Start with his articles on batteryuniversity.com to get a feel for the concise, friendly, helpful style.
The publisher, CADEX, out of Vancouver, is the author's own company. He designed and sold battery charging stations since the 90's. The book does have some marketing flavor but certainly not annoying. I would rather be marketed to via a world-class tutorial than any other means.
He is not a chemist.