For the first six months of owning aniPhone 15 Pro Max , my battery health never dipped below 100 percent . That might not seem like a big peck , but when you consider my iPhone 14 Pro Max lost about a percentage point each calendar month the late year , I was extremely impressed by the battery ’s power to keep on its full electrical capacity so long after I bought it .
In the past three week , it has n’t been so great . In other April I noticed that my battery wellness had finally drop to 99 percentage , as expected after six month of use and daily charging . But throughout April and May it ’s dropped about one per centum each hebdomad and now stands at 92 percent . Even if the stride slows some , there are five months until the iPhone 16 get , so it ’s likely that my battery health will dunk to around 85 percentage or less .
That might not seem catastrophic , but it ’s a steep fall from just a duad of generation ago when battery health would stay in the mid-90s after a year . And that ’s when the iPhone electric battery was only guaranteed for 500 cycles . Now , Apple says batteries of iPhone 15 example are contrive to hold back 80 percent of their original capacity at 1,000 complete charge cycles under “ ideal weather condition . ” I ’m only at 270 oscillation , but the late rate of decline has me concerned about just how long my iPhone 15 Pro Max will last .
metalworks
I do n’t think I ’m doing anything different than most people do . I generally charge it overnight attach to a magnetic charger on my nightstand and keep80 % Limiton most days . I do n’t countenance my phone get to zero very often , usually charge it when it hits the Marxist , and seldom commove it just because I ’m sitting at my desk . But still , my battery health is dropping quite a bit .
As a Macworld reader points out , my reliance on wireless charging could be the perpetrator . He shared aniFixit articlethat appear at the efficiency of wireless charging vs wired charging and concludes that a mass of push is squander when placing your phone on a wireless charger :
Over two hours and 10 minute , the phone charged from 0 % to 100 % and had a peak great power draw of 20W at the 30 % armorial bearing mark . The battery temperature also peaks short after at 30 ° C and begins to turn down back down as the battery cell fills and the office draw from the briny also worsen . The total energy used to fully charge a 12.7Wh barrage fire was 18.25Wh , which intend there was a 5.55Wh or 35.9 % loss of vitality . That ’s a lot of waste , and it ’s also our good case scenario .
That wasted free energy could easily be causing my stamp battery to degrade quicker than it should and be responsible for the recent abasement . However , I ’m uncoerced to bet that more than 90 percent of iPhone users rely on either MagSafe or wireless charge up to take up their iPhones — and likely wo n’t break after reading this .
Granted , most people don’tcheck their stamp battery healthweekly and many do n’t even know it be . However , they will mark when their phone starts dying sooner in the day . We expect iPhones to last many years , and with the latest chips and presentation , along with 4 - 5 years of iOS update , they in general do . But with my iPhone 15 Pro Max , I question if the electric battery will keep up .
For advice on charging your iPhone read : How to charge an iPhone by rights .
