I can have the phone completely at 100%, and not use it at all, but in the morning it will be down to 60%. or less, same thing during day, not used, but in a few hours drains. I also just changed the battery, happened to old battery and new one??????
Danohone, having that battery life when you need is can certainly be important. This is not at all uncommon for smartphones as things can be running in the background without you even touching the phone. Also, if the phone is set to vibrate or silent, you can see a difference on that battery drain. Find ways to extend that battery life at http://spr.ly/65898N7gf.
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Sometimes a phone trying to search for a good 4G signal and dropping into 2G 3G and back will kill a charge. Is that happening on your device, or do you have a constant / strong 4G signal where you have it for prolonged periods?
If it's constantly trying to sync email (checking too often) that can be another cause of battery drain.
There is a means to look at Battery Consumption (Settings | Battery).
There is a means to look at data usage (Settings | Data Usage) - you need to enable Mobile Data.
You can also download a process monitor (Simple System Monitor) to see what is using the CPU.
All three of these can be used to see what your phone is grinding on and eating up the battery.