Buyers of the new iPhone 6 are saying 2 identical iPhones bought at the same time, in the same shop, may have a completely different battery life depending on who manufactured one of the main chips. The variation is almost 2 hours between each.
So Why can the iPhone 6S battery life vary by up to 2 hours?
Well Apple has decided to have 2 completely different manufacturers  produce the A9 processor chip – the ‘brains’ behind the iPhone 6S. Normally companies only use a single manufacturer to ensure quality and consistency but for some unknown reason Apple has decided to use 2.
The A9 chip is designed by Apple but manufactured by either Samsung or TSMC. So you would think that the chip should perform the same however differences in their production is apparently having an effect on how efficient they are. The TSMC version of the A9 chip has much better power consumption, according to user reports shared on sites including MacRumours  and Reddit .
|Samsung Chip||TSMC Chip|
|Manufacturing Process||14nm FinFET||16nm FinFET|
|Battery Life||6 hours||8 hours|
The battery on the iPhone 6S with the TSMC chip lasts almost 8 hours while running a suite of battery-intensive activities, while the Samsung one managed barely 6.
How to find out which chip your iPhone 6S has
You can figure out which version of the chip is installed in your phone with the Lirum Device Info App. Samsung’s chip shows up as N66AP or N71AP, while TSMC’s appears as N66MAP or N71MAP.
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