The Energizer phone never released, it was cancelled.

My first smartphone was a Note 2. I put a 10 amp hour zero lemon battery on that, was great. I did the same thing with the Note 4. Nowadays everyone makes it ridiculous to swap a battery and I don't like the "wrap around style" but thankfully phones with 4-5 amp hour batteries with more efficient SoCs are available these days so it's not as bad.

I'd still love to see a large format phone with a 6-7 amp hour battery built in though. It would barely be any thicker and would mean once a week charge for me.

better displays are mostly engineering problems while better batteries are a science problem.