Here is the main Reddit thread:
https://www.reddit.c...rking_with_the/
Google searches on the subject bring up the situation on other webpages as well. Looks like a firmware update disabled the non-OEM batteries, as one of the comments near the top describes a third-party-battery that used to work but is now blocked with an LCD warning. Many Z8 users with third-party batteries inserted receive the LCD warning, "This battery is unable to provide data to the camera and cannot be used. For safety, chose a battery designed for use in this camera." Ironically, the battery is able to provide enough data to the camera to display the error message, and was good enough to power it enough to take photos and videos before Nikon bricked it.
I'm extremely happy with my third-party "knockoff" En-El20 batteries for My P1000. The disheartening news is now making me sure to NEVER upgrade the firmware on my camera. I just downloaded the current, latest, (V 1.6) firmware and made a few backups, to cover the event that Nikon gets really scummy and has Snapbridge on my iPhone trick me into upgrading the firmware, or otherwise has the software or some other sneaky OTA trick upgrade it against my will and brick my perfectly safe and perfectly working batteries.
What's going here? Is this really, really a safety/overheating issue, where OEM batteries are safe, and third-party ones are not, or is this an unethical, disgusting money grab? One can buy the OEM from Nikonusa for $72.95:
EN-EL15c Rechargeable Li-ion Battery | Nikon
Or from B&H for $69.00
https://www.bhphotov...on_battery.html
Or they can get a two pack (same capacity) from Amazon for between $26.63:
https://www.amazon.c...01M27X25G/HJ1ZQ
and $42.42:
https://www.amazon.c.../dp/B08KSHD5X9/