The iPhone 6s and iPhone 6s Plus, Apple's newest flagship smartphones, have been hit by complaints of uneven battery life posted on the Internet.

It seems phones with the A9 chipset manufactured by Samsung have a tendency to deliver around two hours less battery life than those with the A9 chipset made by Taiwan Semiconductor Manufacturing Company. This battery problem has created a new issue for Apple's latest iPhone models, especially for those fitted with the Samsung-made processor, according to Tech Times.

It was revealed on Reddit that TSMC-based iPhone units have a battery score of 4,703 and lasted for almost eight hours. The units with Samung's chipset, however, lagged far behind with a battery score of 3,653 and only lasted a little over six hours.

"Both phones were tested using the same back up, same settings," the tester wrote. "Also tried them as new phones. Results were similar."

Although it seems Samsung appears to be to blame for this short battery life problem, some tech users pointed out that the TSMC units were running on a Rogers SIM card, while the ones with the Samsung chip didn’t have any SIM card inserted in it. Apparently, this could account for the difference in battery life.

On paper, it’s been stated time and time again that Samsung's chipset is much better than the one from TSMC, especially since the former has a 14 nanometer FinFet process believed to be more advanced than TSMC's 16 nanometer technology.

As of the moment, it remains to be seen how the battery tests affect real world use of the phones. It’s worth noting, however, that 60 percent of the iPhone 6S units in the tech market today have chipsets from Samsung. Furthermore, only 30 percent of the iPhone 6S Plus in stores have a chipset from TSMC.

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