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Don’t Use a Warm iPhone
I like to play video games on my iPhone. After a good hour of gaming, my iPhone starts to warm up. Games and multimedia applications push an iPhone to its limits. Sometimes low-performance apps, such as social media applications, can also push an iPhone to its limits due to sloppy development. When I first got my iPhone 6, a social media app was draining the battery and causing it to get very warm. It was eventually fixed with an update.
When your iPhone starts to get warm, put it in sleep mode and set it on a metal surface. Wait until your iPhone cools before using it. Temperatures as low as 86º F can start to damage your iPhone’s battery. If it feels warm to the touch, give your iPhone a rest.
Charge Your Battery at 80% and Calibrate Battery Periodically
There’s a lot of controversy as to ideal charging methods. I’ve read many different suggestions, most of which are unsubstantiated. There are some wild theories that you should always keep your iPhone battery between 40% and 80%. This seems to be a misunderstanding of different battery care advice, which I will explain later in this article.
According to both Apple and Battery University, it’s a good idea to top off your iPhone’s battery. The last 80% of the iPhone’s charge cycle trickles current to your device. It is designed to improve the lifespan of your battery by minimizing heat. Indeed, Apple is well aware that rapid charging is detrimental, but there is a tradeoff. Users can’t be expected to wait all day for their battery to charge. This would also be a competitive disadvantage for Apple. They found a decent compromise in letting the battery charge faster for the first 80%. The latter 20% is a slower trickle charge.
If you always charge your iPhone before it drops below 80%, it will minimize heat stress to the battery. According to Battery University, partial discharge cycles reduce stress and increase battery lifespan. With a 100% depth of discharge, users can expect 300-500 charge cycles. With 25% discharges, one can expect 2000 – 2500 charge cycles. Even though the charge cycles are more shallow, one can expect more than 5 times as many charge cycles. A 10% discharge cycle provides up to 4700 charge cycles.
Apple doesn’t agree. Their information claims that a 25% charge counts as 1/4 of a charge cycle. Apple may be approximating this estimate. Battery University’s recommendations apply to all lithium-ion batteries. Apple’s information is specific to the iPhone. Battery University presents more detailed and compelling information. I favor their theory over Apple’s. They also don’t make money from replacing batteries and iPhones.
In either event, topping off your iPhone at 80% will minimize heat and stress. The trickle charge uses less current and produces less heat. This will prolong the lifespan of your iPhone.
There is one caveat. Users should calibrate the battery about once a month. This process involves draining the battery, in addition to other steps. For more information on battery calibration, please read “How to Calibrate iPhone Battery”. (continue…)