Sadly I didn’t take particularly good notes on battery life, but did not bring a battery pack.
It did fully discharge once when arriving home. I don’t remember when I unplugged it or if it had switches on or off. It was likely around 8 hours when I looked at it to charge, but I can’t say for certain. Likely left the wifi and cell modems on, but I don’t remember.
I was pretty religious about any time we got back to the hotel to charge the phone.
Sorry, that’s the best I can give you