11 Vote

How long may I charge my phone? Risk of battery damage when charging to long?

Question by Guest | 2013-12-06 at 12:31

I would be interested in whether a mobile phone or a smartphone can actually suffer a damage when charging the battery too long and leaving the phone to long on the power grid.

Often, I am charging my smartphone overnight at the socket, which is often a time of 8 to 10 hours - although the phone is fully charged after 2 hours.

Therefore, it would be interesting to know whether it does not matter if you leave your phone on the charger for quite a long time or if it is better to disconnect it from the charger as soon as the battery is full. Maybe, I would have to set an alarm at night to disconnect my mobile in time, if it is necessary.

11 Vote

As far as I know, your mobile phone contains charging electronics that controls how your battery is charged.

This controller monitors the state of your battery and turns off the power when the battery is full. Therefore, it should not be a problem if you leave your phone longer at the charger than it needs for fully charging the battery.
2013-12-08 at 14:27

ReplyPositive Negative
22 Votes

Almost always I am charging my phone overnight and up to now, nothing bad has happened.

So, I guess that's not a problem.
2013-12-08 at 22:40

ReplyPositive Negative
11 Vote

Specifically, of course, it depends on what type of battery you are using. In modern lithium-ion batteries (presumably you have such one in your smartphone), there should be no problem.

Lithium-ion batteries should not have memory effects any more, so it does not matter if you let the phone longer on the charger or if you start your recharging even at 10 or 50 percent.
2013-12-12 at 02:02

ReplyPositive Negative
-11 Vote

It is problematic only if you never discharge the battery and the phone is always connected to the charging cable. This will surely break your battery within half a year.

However, this mainly concerns notebooks and laptops that are always run on mains operation without taking out the battery before. For this, you can have a look at the question about laptop batteries on mains operation.
2013-12-12 at 19:05

ReplyPositive Negative

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