Keeping the phone charging while sleeping at night and getting 100% charge when we wake up in the morning has become our daily routine. But it is often heard that keeping the phone charging all night can damage the battery. Lithium-ion batteries have a limited shelf life and frequent charge-discharge from 0 to 100 percent reduces their lifespan. Earlier, it was advised to adopt 20-80 formula (always keep the battery between 20% to 80%) to increase the life of the battery. But is it dangerous to charge even today's modern smartphones overnight?
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Is it safe to charge the phone overnight?
Yes, it is generally safe to charge today's modern smartphones overnight. Today's smart charging controls do not allow phones to charge at maximum speed all the time. By understanding the sleeping and waking habits of the phone user, it slows down the charging speed or stops charging at some time.
Optimized iPhone charging: The 'Optimized Battery Charging' feature in Apple's iOS limits the battery to 80% during overnight charging and then fully charges it to 100% just minutes before the user wakes up in the morning. Apart from this, in iPhone 15 and later models, the user can also set the charge limit as per his choice between 80% to 100%.
Samsung Battery Protection : Samsung Galaxy phones also have the option to limit charging to 80%, 85% or 90%. Also, through its 'Adaptive Mode' the charging is adjusted at night according to the user's routine.
Adaptive charging of Google Pixel: Pixel phone takes about 14 days to learn the charging pattern of the user and after keeping the charge till 80% at night, it completes 100% charging when waking up in the morning.
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Should one always charge up to 80%?
According to experts, 80% charging is a compromise between extending battery life and daily use. If you can easily spend the whole day with 80% charge, then keeping the charge limit at 80% is foolish. But if you have to travel or do heavy use throughout the day, then there is no harm in charging up to 100%.
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Overheating is the real enemy of the battery
The biggest reason for battery failure is not the charging percentage but the temperature. Lithium-ion batteries are very sensitive to high heat.
Points to keep in mind: While charging your phone at night, never keep it buried under the pillow, blanket or bed. Due to this, heat cannot escape and overheating occurs. Keep the phone in an open place where the air quality is good.