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Hey folks - hoping to get some advice here. Need a little help with my iPhone 6 Plus.

I've been using the phone since the device launched, and really do love it. The display is beautiful, apps work great, overall the phone performs fantastic... and the battery is amazing... well, until recently.

For whatever reason, over the last few weeks my battery won't even make it a day on a charge. I used to be able to go a day and a half (sometimes TWO days) on a charge. This dropoff in performance was sudden, and I haven't installed or removed anything from my phone during this time.

Any ideas on how I could diagnose, or better yet fix? I've heard about recalibrating the battery, but haven't dug in any deeper than that at this point.

Any help is appreciated! Thanks in advance!