Why battery suddenly won't last a day on the Huawei Honor 6 Plus?

My mobile is less than 6 months old and the battery usually lasts a few days before I have to charge it but the last couple of days it's not even lasting the day! It's even draining when not in use!

Hi faith. You maybe have a change in usage with your phone. Did you install more apps now? Also, being connected to data or Wi-Fi drains the battery fast.

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