Does leaving your battery saver turned on permanently on your phone cause any damage? Not really, actually it can help your phone have a better battery life for longer.
It's not ideal, but it's better than your phone being completely dead. You can turn on Battery Saver mode at any time. Just head to Settings, Battery, and then Battery Saver.
You can set Battery Saver to turn on automatically when your phone's battery gets low. You can also turn on Battery Saver at any time.
Though turning on Low Power Mode permanently is an experiment you might want to try, if you find that you need to keep Low Power Mode on all the time to get decent iPhone battery performance, it's very possible that your battery could be degraded or have other problems.
It is absolutely safe, although remember that Low Power Mode will turn off automatically if battery level reaches 80% while charging. Also, don't forget that LPM temporarily disables some of the phone's features and services.
With battery saver on, your phone can charge more quickly, as the battery life isn't being used up by these background tasks.
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.
Maintain good battery health
It is always recommended by experts to start charging your iPhone when it hits 25 percent. Similarly, only charging the battery up to 85 percent will help the iPhone's battery to maintain good battery health and deliver extended battery life.
The golden rule is to keep your battery topped up somewhere between 30% and 90% most of the time. Top it up when it drops below 50%, but unplug it before it hits 100%. For this reason, you might want to reconsider leaving it plugged in overnight.
This is totally safe. But it won't be a pleasent experience to use the phone in battery saving mode all the time. Phone batteries are designed to undergo good number of charing and discharging cycles, so make the best use of it.
Battery saver mode changes certain settings to conserve battery power until you can recharge your phone. If you turn Battery saver mode On, it will automatically activate when the battery charge level drops to the level you set.
There are too many apps running in the background. The screen is too bright. The screen is staying on too long before going to sleep. The phone doesn't have service.
Background apps essentially function even when you're not directly using them. Examples include VPN, anti-virus, health, and calendar apps. These apps monitor or control certain aspects of your phone without you intervening, which, while convenient, drains your battery significantly.
Modern smartphones have optimized batteries that will stop drawing power once they reach 100 percent. However, when you leave it on the charger, the phone will inevitably lose a little bit of power as it sits there because that's just what batteries do.
As the battery's useful life is measured in full charge cycles, with only a small contribution from chronological age, leaving the battery at 80% but still connected to power achieves 2 aims: Not leaving it at 100% for long periods of time, and reducing the number of full charge cycles while still powering the phone.
Stop Charging to 100 Percent Every Time
As a good practice, you should avoid charging your iPhone to 100% all the time and not let it go below 25%.
Heat is a battery's enemy. Cold is no friend to batteries either, resulting in a shorter use time, but that is only temporary until your battery warms back up again. Apple says your iPhone can safely run in temperatures of up to 95 degrees Fahrenheit. Beyond that, irreversible damage can occur to the battery.
It's especially important to avoid exposing your device to ambient temperatures higher than 95° F (35° C), 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.
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.
They concluded that switching from light to dark mode saved only up to 9% power on average for different OLED smartphones at 30-50% brightness, and said the power efficiency depended on the brightness of OLED screens.
Fast charging doesn't generate this much heat, but it does generate enough heat to potentially impact your phone battery. Another negative impact of fast charging is that it means you might use your charge cycles (from 0 percent to 100 percent) faster, which in turn reduces the life of the battery.