Well, the default battery that this phone comes with is a 1300mAh one. For light usage it may last through the day but for someone like me it does not. One of the things I got for Christmas was a 2150mAh battery. So far it has lasted way longer even through my normal usage. I am sure I will find out within a week as my usage fluctuates a bit each day. The battery is bigger so it came with a bigger case back. It adds weight to the phone and makes it thicker but I happen to like the feel of it better than before. If those changes are all to get used to for more battery power I would say it is worth it.