A battery will last based on the usage, background settings for wifi, NFC, App permissions, and cellular connectivity. I have made several adjustments and achieved a remaining percentage of 20-30% left at the end of the day. I would advise going to Android.com and looking at all the setting recommendations for your needs and adjust accordingly. Remember, this is a bare bones OS with no carrier or brand adjustments, so you need to decide what is best for your device in this circumstance, not the manufacturer.