I have a Cubot King Kong 5 Pro. Yes, it’s named that.

I haven’t even had the endurance to test its battery life. Thing lasts forever if it has no SIM card / WiFi / BT and might as well be a MP3 player that lasts you weeks.

edit: I turned it on 5 days ago after this comment and turned weefee/BT/NFC off. 85% remaining.

Should be a fun thing to watch.