When Apple launched the iPhone 13 Pro Max two years ago, it clearly stood out as one of the best smartphones in the world. However, it faced fierce competition from brands like Samsung, Vivo, Xiaomi etc. In certain situations, some of these brands were able to outperform the iPhone 13 Pro Max in speed tests and camera comparisons. However, there was one area which was impossible for any other brand to compete with the iPhone 13 Pro Max. That being the battery life.
Apple’s iPhone 13 Pro Max has flexed its muscles in this category for two solid years without any other smartphone being able to beat it. Even though Apple advertised the iPhone 14 Pro Max as the most power-efficient smartphone, it still could not stand a chance against the iPhone 13 Pro Max. Not even Samsung’s Galaxy S23 Ultra could defeat the iPhone 13 Pro Max’s power efficiency.
Apple has recently announced the iPhone 15 Series with the pro models featuring the latest A17 Pro chip. Apple says that the A17 Pro chip is the most power-efficient chip in any smartphone today. Well, the company made the same statement about the A16 chip, but it fell flat against the A15 chip of the iPhone 13 Pro Max. For this reason, a popular YouTuber named Mrwhosetheboss has conducted a battery test using the iPhone 13 Pro Max, iPhone 14, iPhone 14 Pro Max and all the iPhone 15 Series. This is to check Apple’s bold claims over the battery efficiency of the iPhone 15 Pro models.
Factors that Influence Battery Life of iPhones
Before we get into the battle of battery endurance, let’s take a quick look at some factors that may affect the battery life of your iPhone. Take this as a bonus gift from the editor to you the reader, as these few tips could be helpful in maintaining the battery life of your iPhone. Apple has really come a very long way in working on the battery life of the iPhone. Some years back, iPhones were one of the smartphones with the worst battery lives, but that’s not the case anymore.
Even with that, some Apple users still find it quite difficult to maintain the battery of their phone throughout the day. In this case, you can’t blame Apple but yourself. The user may either be doing something wrong, or they don’t know what the problem is. Whichever be the case, these tips may help you know whether you’re really doing something wrong.
Factors that can affect the battery life of an iPhone:
1. Usage Patterns: How you use your iPhone plays a significant role in battery life. Activities such as gaming, video streaming, and GPS navigation consume more power than simple tasks like texting or checking email. High-intensity usage drains the battery faster.
2. Screen Brightness: The screen is one of the most power-hungry components of a smartphone. Higher screen brightness settings require more energy. Keeping your screen brightness at a lower level or using auto-brightness can help conserve battery.
3. Background Apps: Apps running in the background can continue to consume power, especially if they’re using location services or refreshing data. Managing which apps can run in the background and turning off unnecessary background processes can extend battery life.
4. Signal Strength: Poor cellular or Wi-Fi signal strength can lead to increased battery drain, as your iPhone works harder to maintain a connection. In areas with weak signals, your iPhone may use more power to find and maintain a connection.
5. Battery Health: Over time, the iPhone’s battery capacity naturally decreases. A degraded battery may not hold as much charge and can result in shorter battery life. You can check your battery’s health in the Settings app under “Battery” > “Battery Health.”
It’s essential to be mindful of these factors and adjust your usage and settings accordingly to optimize your iPhone’s battery life. Additionally, using features like Low Power Mode and enabling battery-saving settings can help you get more out of a single charge.
Basic Details of the iPhones Used in the Test 
Before we get into the battery test of these 7 selected iPhones, there is something quite important to take into consideration. We will first keep in mind the battery sizes and chipsets that these phones carry. We will also consider the screen sizes and the refresh rates of each phone. In every smartphone, these are the main features that determine the battery endurance of the smartphone.
iPhone 13 Pro Max: The iPhone 13 Pro Max features a 6.7-inch OLED display with 120Hz refresh rate. It carries a battery size of 4352mAh and features Apple’s Bionic A15 chip.
iPhone 14: Apple launched the iPhone 14 in 2022 which featured a screen size of 6.1 inches. However, this device only featured a 60Hz display and came with a battery capacity of 3279mAh. Just like the iPhone 13 Pro Max, the iPhone 14 also came with Apple’s A15 Bionic chip under the hood.
iPhone 14 Pro Max: The iPhone 14 Pro Max also featured a very similar screen to its predecessor. A screen size of 6.7 inches which features Apple’s 120Hz Pro Motion technology. For some reason, Apple decided to reduce the battery capacity of this model from 4352mAh to 4323mAh. This model runs on the A16 Bionic chip.
iPhone 15 Series Basic Specifications
iPhone 15: The basic iPhone 15 also features a 6.1-inch display and a disappointing 60Hz refresh rate. Under the hood, it runs on the A16 Bionic chip. The battery capacity of this device is 3349mAh, a slight increase over that of the iPhone 14.
iPhone 15 Plus: This model also comes bundled with the A16 Bionic chip from last year’s pro models and a 6.7-inch display with 60Hz refresh rate. It draws its power from a battery capacity of 4383mAh.
iPhone 15 Pro: The iPhone 15 Pro also features the same screen size as its predecessor with a 120Hz refresh rate. It features the latest and the acclaimed most power efficient A17 Pro Bionic chip. It also runs on a battery with a 4383mAh capacity just like the iPhone 15 Plus.
iPhone 15 Pro Max: The best and greatest iPhone ever made also features a 6.7-inch OLED display with 120Hz refresh rate. With a battery capacity of 4441mAh, the iPhone 15 Pro Max features the largest battery ever used in an iPhone. It also runs on the new A17 Pro Bionic chip from Apple.
The Battery Drain Test: iPhone 13 Pro Max to iPhone 15 Pro Max
Now that you have the basic specifications of all seven iPhones in mind, let’s quickly talk about how the test was conducted. Mrwhosetheboss performed this battery drain test by running popular apps that are known for draining battery lives. Most of these apps are common apps for the everyday user. For the purpose of this test, he used apps like Facebook, TikTok, Spotify, ChatGPT, Camera app, Zoom, YouTube and games. There were other apps, but we will focus on these popular ones for the purpose of this article. He run each app on all the seven iPhones for 1 hour to see how they handled battery consumption. Therefore, we will list each app and how much battery it consumed on each phone within one hour.
iPhone 13 Pro Max to iPhone 15 Pro Max Battery Drain Test: TikTok 
After running TikTok for one hour on all seven iPhones, the following indicates the battery percentage left on each phone.
Apple iPhone 13 Pro Max: 96%
iPhone 14: 93%
Apple iPhone 14 Pro Max: 93%
iPhone 15: 92%
iPhone 15 Plus: 94%
Apple iPhone 15 Pro: 89%
iPhone 15 Pro Max: 96%
Battery Drain Test: Spotify 
iPhone 13 Pro Max: 88%
iPhone 14: 84%
Apple iPhone 14 Pro Max: 86%
iPhone 15: 85%
iPhone 15 Plus: 88%
Apple iPhone 15 Pro: 78%
iPhone 15 Pro Max: 89%
Battery Drain Test: ChatGPT 
iPhone 13 Pro Max: 81%
iPhone 14: 74%
Apple iPhone 14 Pro Max: 80%
iPhone 15: 78%
iPhone 15 Plus: 83%
Apple iPhone 15 Pro: 70%
Apple iPhone 15 Pro Max: 83%
iPhone Battery Drain Test: Zoom Meeting 
Apple iPhone 13 Pro Max: 66%
iPhone 14: 53%
Apple iPhone 14 Pro Max: 61%
iPhone 15: 64%
iPhone 15 Plus: 71%
Apple iPhone 15 Pro: 52%
iPhone 15 Pro Max: 69%
iPhone Battery Drain Test: Camera App 
Apple iPhone 13 Pro Max: 40%
iPhone 14: 21%
iPhone 14 Pro Max: 34%
Apple iPhone 15: 33%
iPhone 15 Plus: 48%
iPhone 15 Pro: 23%
Apple iPhone 15 Pro Max: 43%
Battery Drain Test: YouTube App 
iPhone 13 Pro Max: 33%
iPhone 14: 13%
Apple iPhone 14 Pro Max: 27%
iPhone 15: 24%
iPhone 15 Plus: 42%
Apple iPhone 15 Pro: 15%
iPhone 15 Pro Max: 37%
Gaming and Conclusion
During the gaming test some of the phones did not have enough battery power to move on. Therefore, our test will be concluded on the gaming apps. Now, how long did each phone last during the test, and which phone came out to be the best iPhone in history when it comes to battery life? Is the A17 Pro Bionic chip really the most power efficient chip in the world? Let’s find out below.
After the whole test came to conclusion, Mrwhosetheboss listed the phones from the weakest to the very best in terms of battery life. Hence, we will list each phone in that order and indicate how long it lasted during the iPhones battery drain test.
The Results of the Test
7. iPhone 14 – Lasted for 9hrs and 2 minutes.
6. Apple iPhone 15 Pro – Lasted for 9 hours and 20 minutes.
5. Apple iPhone 15 – Lasted for 9 hrs. and 57 minutes.
4. Apple iPhone 14 Pro Max – Lasted for 10hrs and 54 minutes.
3. iPhone 13 Pro Max – Lasted for 11 hours and 13 minutes.
2. iPhone 15 pro max – Lasted for 11hrs and 41 minutes.
1. Apple iPhone 15 Plus – Lasted for 13hrs and 19 minutes.
Checking from the list, you could see how well the A17 Pro Bionic chip from Apple manages battery life. Finally, the iPhone 13 Pro Max is dethroned from the top list after consistently staying in that position for 2 years. Two devices from the iPhone 15 Series took the first and second positions but unfortunately, the A17 Pro could not stay on top as the company had made us believe. As a matter of fact, it is almost two hours behind the iPhone 15 Plus which is powered by last year’s A16 Bionic chip. In terms of high-end flagship phones, the A17 Pro can pride itself as the most power efficient chip of the moment, but in general, nothing comes close to the A16 chip in the iPhone 15 Plus.
Source / Via: Mrwhosetheboss
