iPhone Battery Health Percentage Found to Be Meaningless

The percentage of iPhone battery health that declines over time is negligible and deceptive because it doesn’t determine the actual battery capacity, claims a YouTube channel after studying how iPhones analyze their battery health. Apple began showing iPhone battery health percentages in 2018 after public outcry about quietly limiting phone performance to mitigate unexpected shutdowns. So far, this has been seen as an aspect of understanding how long an iPhone can be used without going to a service center.

A video posted by YouTube channel Piet Forward shows that the battery percentage on iPhones introduced with iOS 11.3 has no real benefit and is claimed to be fake.

It is known that not all batteries have the same capacity. Due to the chemical reactions that occur during the generation of energy, batteries provide consumers with different capacities.

But instead of weighing the differences, Apple looks at the iPhone’s nominal battery capacity to calculate its health percentage. This is where the conflict arises.

To illustrate the difference, the narrator in the video picks up two iPhone models – iPhone XS and iPhone 12 Pro. The iPhone XS is at 83 percent of maximum capacity, while the iPhone 12 Pro appears to be at 100 percent of capacity.

The change in maximum capacity does not reflect the exact battery life on both iPhone models. On the other hand, the only difference is that the iPhone 12 Pro went through 97 charge cycles during the test, compared to 466 charge cycles for the iPhone XS.

Another difference is why Apple shows 100% battery health even though the iPhone 12 Pro has 97 charge cycles, which is Piet Forward’s theory. Apple’s Paul himself says that “with lithium-ion batteries, the capacity decreases slightly with each full charge cycle.”

By analyzing the iPhone, the moderator suggested that when calculating the current percentage of battery life, Apple does not consider the actual capacity and uses nominal capacity to estimate how much battery life is left in the iPhone. The actual capacity can be higher than the nominal capacity in some cases, so you can see your iPhone’s 100 percent capacity for a while even after a few charge cycles.

“It’s like filling the gas tank in your car … everything is digital now, but with a gauge, you fill the tank and it comes out of F and it takes a while – a lot of gasoline burns back at F,” one Teller said.

The video was released in April but has now been pulled back by ZDNet.

Gadgets 360 Apple has requested comment and will update this section if the company replies.