This app was mentioned in 9 comments, with an average of 0.33 upvotes
It's likely that there are no high-end phones coming out with removable batteries this year and in the near future. If you absolutely need the feature, you'd have to go with a LG G4 or a Galaxy Note 4 (both still very good phones).
To find out about new phones, personally, I check the /r/Android page a couple times a week, I sometimes go on tech websites like AndroidAuthority, AndroidPolice, The Verge, CNet, MobileSyrup (that's Canadian tech news, though) and mostly I read news on the app Appy Geek. It's a tech news aggregator that makes it easy to browse news and see content.
Appy Geek. (https://play.google.com/store/apps/details?id=com.mobilesrepublic.appygeek)
Link me: Appy geek
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Appy geek choose your topic appy geek
Appy geek choose your topic appy geek