Is it bad to charge my phone to 100 percent? For optimized battery life, your phone should never go below 20 percent or never above 80 percent. It may put your mind at ease when your smartphone's battery reads 100 percent charge, but it's actually not ideal for the battery.
If you charge your iPhone overnight, that means it remains at 100% charge for hours on end. This is bad and will accelerate battery aging. To fix this, the Optimized Battery Charging feature on your iPhone prevents it from charging past 80% to reduce some of that stress.
Therefore, we recommend the following: Do not fully charge or fully discharge your device's battery — charge it to around 50%. If you store a device when its battery is fully discharged, the battery could fall into a deep discharge state, which renders it incapable of holding a charge.
To preserve the lifespan of your iPhone battery, Apple has created a battery optimization feature in iOS 13 that slows down how quickly your iPhone charges and will even hold it at 80% to avoid overstressing the battery. That's why your phone sometimes charges all the way, but other times gets stuck at 80%.
iPhone has a setting that helps slow the rate of your battery's aging by reducing the time it spends fully charged. This setting uses machine learning to understand your daily charging routine, then waits to finish charging past 80% until you need it.
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.
Therefore, we recommend the following: Do not fully charge or fully discharge your device's battery — charge it to around 50 percent. If you store a device when its battery is fully discharged, the battery could fall into a deep discharge state, which renders it incapable of holding a charge.
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.
And you can try it right now! Hamilton says that you should only be partially charging your phone to slow down the depletion of your batteries life cycle. She says the sweet spot to keep your battery charged is at 25-85%. Find out why your phone is charging slowly.
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.
When should I charge my phone? 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%.
Shomes recommends charging your iPhone as it needs it. If you go to sleep and it has a 40 or 50 percent charge, leave it. Then charge it some time during the next day when it gets into the red. That way, the battery won't be stressed, and its health will last way longer than it will when overnight charging.
To put it simply, there's no danger in using your phone while it's charging. It's completely safe to use your phone from a wall outlet or portable charger and does not send electrical waves through your body.
This rule says that when charging your phone's battery, you should only charge it between 20% and 80%. In other words, you should never let your phone's battery go completely dead (below 20%) or completely full (over 80%).
Only Charge to 85% to Optimize Battery Life
As most lithium-ion batteries' capacity to hold maximum charge gets reduced after 500 charging cycles, Protect Battery may decrease the aging process and increase the battery's operational life span.
Most Smartphones have a lithium-ion battery that lives longer when charged regularly. Unlike the nickel batteries used in older phones, lithium-ion batteries do best when kept above a 50 percent charge. Repeatedly allowing the battery to drain fully may shorten its life and decrease its overall capacity.
Android phone manufacturers, including Samsung, say the same. “Do not leave your phone connected to the charger for long periods of time or overnight." Huawei says, "Keeping your battery level as close to the middle (30% to 70%) as possible can effectively prolong the battery life."
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's an outdated and false myth that you should only use 40% of your battery with each charge (in a way that you don't allow your battery to fall below 40% and that you don't charge it over 80%.
So overcharging it at night will inevitably diminish its capacity over time. See the maximum capacity? The iPhone battery has 12% less capacity to store power, due to frequent overnight charges. And a 100% charged phone isn't always the best thing.
Optimized Battery Charging is on by default when you set up your iPhone or after updating to iOS 13 or later. To turn off the feature, go to Settings > Battery > Battery Health & Charging and turn off Optimized Battery Charging.
“Maximum Capacity” shows you how well your battery is performing compared to when it was brand new. While a slightly lower percentage is lower as your phone ages, it should still retain about 80% of the capacity at 300-500 charge cycles. If it starts dropping below 80%, it's time for a battery replacement.