I got my Iphone 13 Pro on 20th November, the battery performance is not as I had heard and seen in the review. Ive been trying to be very conservative in my usage, with Instagram being the most used app. The background app usages are very high. Turned background Refresh off for Instagram and WhatsApp today, will wait to see results ahead. Also i had heard that there literally no/Minimal battery discharge if left unused overnight, but the story here is completely different, it trained 14% overnight.