It's especially important to avoid exposing your device to ambient temperatures higher than 35° C (95° F), which can permanently damage battery capacity. That is, your battery won't power your device as long on a given charge. Charging the device in high ambient temperatures can damage it further.
You might think that because your iPhone's maximum capacity begins at 100%, it's the only condition that can be considered optimal. However, that's not quite true. Apple considers any iPhone with a battery capacity of 80% or above to be in optimal condition.
Battery health degraded
When the capacity of your iPhone battery dips below 80%, you'll see the following message: “Your battery's health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity.
When should I replace my iPhone battery? Typically, when your iPhone holds less than 80% of its maximum capacity, it's time to upgrade the battery. You can check your battery's health by going to Settings then Battery Health.
It was thus found that the dark mode can significantly save battery life in peak brightness, usually employed by smartphone users in outdoor conditions under sunlight.
When batteries chemically age. All rechargeable batteries are consumable components that become less effective as they chemically age. As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in shorter amounts of time before a device needs to be recharged.
Depending upon the length of time between when the iPhone was made and when it is activated, your battery capacity may show as slightly less than 100%. A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions.
Conclusion. As you can see, leaving your iPhone to charge overnight is not a good idea. Not only does it reduce the lifespan of the battery, but it can also cause the battery to overheat.
Excessive heat can damage the battery's capacity and shorten how long it can power your device on a single charge. Very cold conditions can also impact battery life, but the effects are temporary.
These are all fine features, but one thing that Li-On is not really keen on is being reduced to 0 percent and then back up to 100 percent each day. Apple recommends, as do many others, that you try to keep an iPhone battery between 30 and 80 percent charged.
Never leave a phone unused for weeks or months on end without periodically recharging it. If it is going to be unused for a long period, Apple recommends leaving it at around 50% charged (not full, and not empty). You should only use high quality USB power sources to charge your iOS device.
So at what percentage should you charge your phone? The best practice for preserving phone battery health is to plug it in at around 20% and charge it up to 80-90%. This is especially important if you use fast charging, as charging from 0% will cause a lot of heat, and from 80% up, fast charging becomes less efficient.
A new, 100%-80% capacity iPhone battery can hold a charge for 8-20 hours, depending on how it's used. Sitting off in your pocket, it can last all day. Playing games and movies, it will last about a third of the day without a power source.
Optimise your settings.
There are two simple ways you can preserve battery life — no matter how you use your device: adjust your screen brightness and use Wi-Fi. Dim the screen or turn on Auto-Brightness to extend battery life.
The iPhone 11 lasts one hour longer than the iPhone XR. Video playback up to 17 hours, video playback (streamed) up to 10 hours, and audio playback up to 65 hours.
Ultimately, visual performance tends to be better with light mode for most people. However, some people with cataracts and related disorders may prefer the visuals provided in a dark mode.
Raise to Wake tells your iPhone to turn on when you raise it. This is helpful, but it also uses up needed battery power each time you pick up your iPhone. To disable Raise to Wake, go to Settings >Display & Brightness and toggle the switch to the off position.
A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge. Learn more about charge cycles.
Once the battery health percentage drops below 80 percent, the amount of charge your battery can hold starts to diminish. However, that doesn't mean you should rush to get a new battery.