It is a problem that has cursed humanity since the emergence of the mobile phone. We use our trusted pocket computers, commonly known as smatphones so much that they rarely get through a day with any power left. Many of us plug them at night and go off to sleep, as a matter of knowledge that we’ll wake up to a fully charged cellphones.

There are lots of misconceptions and questionable ideas on this topic but – What’s the truth? We’ve got some answers for you.


Charging your phone to 100% damage your battery

You might have probably heard people saying don’t overcharge your mobile phone. Make sure you unplug it from the charger as soon as it reaches 100%.

Speaking to The Verge, Princeton associate professor Daniel Steingart said that the easiest thing to do is to “just keep the device plugged in all the time, or as much as you can.” 

So this means you technically can’t overcharge your device, and it should be fine to charge it to 100%, or leave it on overnight.

While talking to the ACCESS director – Venkat Srinivasan disaproves Steingart’s statement by saying that, you should never charge your battery to 100% rather charge it upto 90%, and then stop.

Srinivasan also said, users should keep their batteries between 30-80%. Once they reach 100% some reactions can occur which degrade electrolytes and can decrease your batteries capacity.

Steingart agreed that this process occurs but keeping your device at 100% does not worsen the reactions.

So this means that once you charge your device to 100%, you can keep it fully charged as long as you like it but keeping your device in the 30-80% battery range could increase its lifespan, though.



Should you leave your phone plugged into the charger overnight?

“Leaving your phone plugged in overnight is okay to do, it will not drastically harm your device,” says Shane Broesky, co-founder of Farbe Technik, a company that makes charging accessories.

Speaking to The New York Times, he said “Smartphones are in fact, smart. They know when to stop charging.” Phones have chips which stop them from absorbing excess electric current once they are fully charged to protect the phone from overcharging.

So far so good, but there are situations when leaving that smartphone plugged in overnight can slowly reduce the lifespan of your battery. Here’s why.

Mobile phones contain a rechargeable lithium-ion (or li-ion) battery. Li-ion batteries charge faster than the regular rechargeable batteries. That’s why you can plug your iPhone or Android phone into a charger, and stimulate it up to at least 80% charge which happens quickly.


What’s the best way to charge your phone?

“The lithium-ion batteries is to keep them charged between 30 to 80%. This allows for the charged ions to continue to work and protect the life of your battery,” says Shane. “Charging your device in short flow throughout the day will give the ions enough energy to keep them going.”

So repeated top-ups are healthier for your battery than one daily charge up. It is not convenient, but that’s the best way to charge your smartphone if you want the longest life possible.


The moral of the story

Basically if you are just a nomral human being who just needs their phone on all the time, feel free to go to 100% and keep it pulgged in forever. But if you care a lot about your battery's life or you don't use your phone that much, go by expert’s route try keeping the device above 50%, but below 80%, turning it off when charging, and never allowing it to deplete fully or to become fully charged. Ultimately, though batteries are meant to be used, and phones are meant to be used too. You don't do any damage by leaving at 100%. You'll probably replace your phone before battery totally dies, or in a worst case scenario, you replace the battery. That's not so bad! 


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