Can you replace an iPhone battery?
How much does it cost to replace a battery on an iPhone?
Are your batteries original?
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Where should I buy an iPhone 6 replacement battery?
Requirements for iPhone 6 battery replacement - Ask Different
Just replaced battery in iPhone 6 - purple/blue spot is showing up on screen?
I had this happen when I installed the glow logo mod on my old iP6+. Check to make sure there is no extra piece sticking up or making the phone thicker than it was previously. This sounds like a pressure spot.
More on reddit.comHow difficult is it to replace iPhone 6 battery?
Its pretty straightforward. The 6 series doesn't have the adhesive layer, which makes things a lot easier.
You get what you pay for with batteries, a $10 eBay battery will perform as such. Ifixit is very good in my experience.
More on reddit.comHi, I was using my old iPhone 6 and it seems to have problems on battery, when it is about 50% on battery it suddenly restarts itself and the battery goes to almost 0% and it suddenly goes up again. I already opened the phone without breaking any components, but I am not sure where to buy a battery from. Since I am an individual, I couldn't order from MobileSentrix. And I heard that amazon batteries are bad and ifixit seems to be the best solution, but it is pretty expensive. Should I get from ifixit or are there any better sellers of batteries?