Unfortunately, leaving your phone charging for hours at a time while you sleep isn't great for your battery and could cause its performance to decline before you're ready to trade in your phone.
Charging overnight is not a danger to your battery in and of itself.
Li-Ion Batteries Generate a Lot of Heat
This would be one of the notable problems you may face while charging your iPhone overnight. Li-Ion batteries are very practical, but lithium is a very reactive material. The heat it could generate can eventually lead to overheating, and the battery could catch fire.
It's Better for the Environment
You don't use your phone while you're asleep, and leaving it on during the night means it's lying dormant, but still using energy, for anywhere from a third to half of the day (of the week, of the year…).
As a result of too high a charge voltage excessive current will flow into the battery, after the battery has reached full charge. This will cause decomposition of the water in the electrolyte and premature aging. At high rates of overcharge a battery will progressively heat up.
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.
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."
Tips: Stop using electronic devices 30 minutes before bed. The National Sleep Foundation recommends that you should stop using electronic devices, like your cellphone, at least 30 minutes before bedtime. Instead, grab the book that's been tucked away in your nightstand and start reading before bed.
The answer is, theoretically, yes – you can overcharge your iPhone battery. However, it's highly unlikely to occur, and the iPhone is designed to prevent this from happening. All modern smartphones are equipped with lithium-ion batteries, and these batteries work differently than traditional batteries.
There is no danger in using your phone while it's charging. When you use your phone while charging, the battery is charging at a slower rate than normal to allow enough power for the ongoing usage.
You can't overcharge any iOS device; the charger is built into the phone and stops charging at 100%. The absolute best way to slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night.
To extend the lifespan of your battery, if the battery gets too warm, software might limit charging above 80 percent.
Yes, it is absolutely find to leave your phone on charge overnight. In fact, it's best practice. If your phone is plugged in, the screen is locked and the phone is connected to WiFi, it will back up every night (assuming you have iCloud back up enabled) and be fully charged and ready to go in the morning.
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.
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.
What's a healthy amount of screen time for adults? Experts say adults should limit screen time outside of work to less than two hours per day. Any time beyond that which you would typically spend on screens should instead be spent participating in physical activity.
1. Short term effect->headaches,decreased attention, ,shortness of temper,sleep disorders depression and eye strain etc.
Choose Relaxing Content
If you're trying to decide what to do, go for passive screen time, such as watching TV, over active screen time, like playing games or being on your phone. Some research shows active screen use may impact your sleep more than passive screen time.
Instead, it will sip power from the battery until it drops to 99% (or thereabouts). The above cycle then simply repeats itself until you unplug the device. Put simply, you can safely charge your devices overnight without having to worry about damaging their internals.
The best practice for preserving phone battery health is to plug it in at around 20% and charge it up to 80-90%.
This will reduce battery stability in the long term. SImply avoid charging overnight and instead charge your phone twice a day, once in the morning and once in the evening. This will keep a healthy battery charge lifecycle and hence keep the battery healthy.
While you certainly don't want to keep your battery in an undercharged state, overcharging is just as bad. Continuous charging can: cause corrosion of the positive battery plates. cause increased water consumption.
There is no “memory effect” like older Nickel Cadmium batteries, so you can charge your iPad anytime you want and even leave it on a charger overnight. The battery will also charge very rapidly, to about 80% in a few hours, while the last 20% is more of a trickle charge and takes longer.
Apple recommends, as do many others, that you try to keep an iPhone battery between 30 and 80 percent charged. Topping up to 100 percent isn't optimal, although it won't necessarily damage your battery, but letting it regularly run down to 0 percent can prematurely lead to a battery's demise.
To turn the feature off, go to Settings > Battery > Battery Health & Charging and turn off Optimised Battery Charging. When Optimised Battery Charging is active, a notification on the Lock Screen states when your iPhone will be fully charged.