If your iPhone 6S is one of those that's having power issues, don’t be afraid: Apple is offering battery replacements for the faulty devices and if you are yet to have issues with your iPhone 6S battery, this post will help you find out if you should be worried or not.
The unexpected system shut-downs make it abundantly clear that something's not quite right, but when Apple addressed the issue and announced the global replacement program, it didn't provide an easy way to find out if your phone is affected.
Unless you really love your phone, it's probably extremely unlikely that you have its birthday marked on the calendar. Not to talk of taking it all the way to the Apple Store and checking in there, Apple gives no easy way to know if your device is eligible for the replacement.
However, 9to5Mac has compiled a list of serial numbers that Apple Store reps are using to identify the affected batteries. To see if your 6S is possibly at risk, just check for yourself.
How to check your iPhone 6S battery’s serial number
There are two ways to Locate your serial number; look at the back of your phone (below the "S" icon) or go to Settings > General > About (Apple gives a more in-depth guide here). Once you have located it, check if the codes in the fourth and fifth position match any of these Q/number combinations:
If you have a match then you should consider taking your phone in for replacement even if you haven't had any issues. Just be wary if your screen is in rough shape — Apple says any cracks or damage will need to be fixed before a battery replacement. If that's the case, you will have to be paying for some compulsory service.
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