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Turn off background app refresh like Ridin Dirty suggests, should stop all of the data use while you aren't using it.
Though that said, battery in these phones is crap after about 2 years usage - Samsungs et all are just as bad as iPhones. Unfortunately, these batteries all lose charge over time, especially as they're constantly charged/uncharged. Getting a new phone will solve the problem a little bit as capacities increase, but over time that battery will degrade too.
Cheaper option may be to just replace your battery.
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