B4 battery is bad. Not B1 bad but second worst so far. B2 was the best battery life I have ever had.
Not sure what's causing the drain in B4 but at 100%, it drops to 60% within an hour and that's using Spotify, a hookup app and email with some texting. Nothing crazy.
Had mine off the charger for about 5 hours, playing Apple Music via bluetooth for a majority of that time along with texting etc.. and I'm sitting at 62%