Same same, 12 mini here (with small battery), still going strong, but I have to say, I have chargers everywhere and when traveling I grab one of my Makita batteries with the USB cap which can charge it 6-7 times (5 Ah). So honestly I wouldn't know how long the battery actually lasts, I suspect less than a full day, or just about a day.

Battery is at 78%, as Apple says: Degraded considerably...

I hope to get it a new bat when I goes to my son in a few years. Really hope the new SE models are the mini form factor...