Mobile devices, is it harmful to constantly keep them on recharging?

Question

iPad

Interested in whether it is harmful, for example, to keep a mobile phone on charge every day at work during the day? Somewhere they write that frequent recharging is harmful, somewhere that this does not apply to modern devices. For what types of batteries is this relevant, for which not? How does this affect them?
It's just as interesting how things stand with this for Apple products. Is it bad for the battery to constantly keep the iPad in the dock?

Answer 1

As far as I know, lithium batteries are charged in 3 stages, namely:
1. The main stage at which the battery is charged with a current that is ~ 0.4 ... 1 of its nominal capacity. During the main stage, the battery gains about 70-80% of its working capacity.
By the way, it is the duration of the main stage of the charge that is indicated in the documentation for the phone, and at the end of it, the phone reports the completion of charging;
2. Finishing stage, in which the battery gets to its full capacity. Formally, this stage is optional, but it is thanks to it that the battery can reach up to 20-30% of its capacity, respectively, the battery life of the device increases proportionally. The value of the charge current at this stage gradually decreases, and the moment when the value of the charging current is sufficiently small from its initial value is considered to be the complete end of charging.
3. Stage of compensation charge. If, after the battery is fully charged, the phone has not been disconnected from the charger, at some intervals, it is recharged with a small current to compensate for the discharge that occurs.
This means that there is no particular harm from keeping the phone on charge.
By the way, despite the fact that lithium batteries have practically no memory effect, in order to obtain maximum battery life, it is recommended to periodically perform full charge-discharge cycles - completely discharge (from turning off the phone with the message “Battery is low”) and fully charge the battery.

Answer 2

If the phone has the correct charge stabilizer, then you shouldn’t worry, especially since the battery (only not in Chinese ones) has an electronics board that controls its operation, charge / discharge, current, temperature.
In general, the charging process goes as follows. First, there is a fast charge, lasting about 2 hours (on average), while the battery is charged with high current up to about 80% of capacity, at the end of its indicator shows that the charge is over. After that, the slow charging mode (low current) is activated, which continues for several more hours.

Answer 3

As a person who wrote a diploma on batteries, I’ll say something like this:
if the phone is more or less modern, then it has a normal battery charge chip that works like this: it charges the phone from 90% to 100%, then it sits down from 100 to 90, and so constantly.
For li-ion batteries, this is not scary. But, contrary to the marketing bullshit about the "memory effect", I will tell you that aging and gradual mixing of the contents of the battery is inherent in all types of batteries. In this mode, in theory, aging should be slower.

Answer 4

I can say about Apple. In general, no, it's not harmful. But, once a month, you need to fully discharge and then fully charge the device. Apple talked about this somewhere in the manuals, otherwise you can charge it as you like. In modern devices, battery controllers are already smart enough.
Unfortunately, as for each specific type of battery, I can’t tell.

Answer 5

As far as I understand, these tips are equivalent for laptops that use a Li-Ion battery? Or are there really some subtleties and nuances from which battery life can vary?

Answer 6

The phone should not be completely discharged. As a result, the capacity of its battery is lost. In general, it feels like the phone feels more cheerful and works faster when charging (Apparently there are power profiles on my HTC Touch Diamond). I myself put the phone on charge all the time as I return home and take it off in the morning. I do not feel a decrease in battery capacity.

Answer 7

The question is within the framework of the topic - is there a difference when charging the phone (I have a Hero) from microusb or from a regular outlet? It just seemed that the phone takes longer to charge from microusb and discharges faster. I heard that it is also “harmful” to charge from him.

Answer 8

I always kept all my phones in charging cradles (I like it when a thing is on the “base”, and does not walk around the room). Batteries have always lived "with a bang" and lived a long life until the end of the phone's life. I have never bought a new battery to replace a dead one. As mythmaker correctly wrote above , the phones (mostly) have fairly smart power controllers and never charge the battery “up to the neck” and, in general, quite cunningly distribute the charge / discharge current.

Answer 9

I saw a swollen battery from a macbook that was constantly connected to email. networks.

Answer 10

On Nokia mobile phones it says "unplug phone from charger". So in my opinion you should not leave phones on charge in excess of the norm.

Answer 11

And what is written on microusb charging? What current does it put out? The standard USB port, without tricks, gives out no more than 500 mA. Some phones need more current to charge. Therefore, phones take longer to charge from a USB computer.

Answer 12

I have a small question on a similar topic.
When buying a new battery, does it need to be charged first and then recharged, or vice versa?

Answer 13

I have an old sonic k510, it is already 4 years old. A couple of years ago, after moving for several months (maybe six months or even more), I used it as a GPRS modem. The phone worked like this for 8-10 hours a day, while constantly being recharged from USB. Nothing happened to the battery (li-ion), it still holds a good charge, it lives for 2-3 days easily.
The only consequence is that the USB port on the motherboard burned out :(

Answer 14

The "memory effect" was inherent in nickel-cadmium and all older batteries. For modern Lithium-Ion and Lithium-Polymer batteries, it is less mature.
But Lithium cells do not like both constant charge and deep discharge. Devices (and batteries) leave the factory in a semi-charged state.
The conclusion is that it is not harmful to periodically recharge the battery. It is harmful either to constantly keep it on charge, or to discharge it below the permissible threshold.

Answer 15

I don’t know what’s wrong with the iPad, but the 3G iPhone doesn’t die for itself in terms of battery life, although I’ve been actively using it for 1.5 years, with everyday charging and discharging. However, I managed to keep it in semi-active mode undischarged for almost 48 hours, being on the road and without charging.

Answer 16

Based on my 2006 SonyEricsson K510i, still working and not having a self-discharge (read very low) battery when lying on a shelf for a year, as well as a dead battery on hp nx6110, a dead battery on HTC Artemis, a dead acc on ASUS eeePC 701 can make some conclusions:
1. If the Li-ion battery is of high quality, then the service life without losing half the capacity is much more than 2 years.
2. If the charge controller is very smart (as a rule , expensive laptop models have good ones), then you can leave the battery for a long time, but as Apple advises, discharge and charge at least once a month.
3. It is better not to bring the battery to the level of turning off the device from a lack of charge (especially laptops).
4. If the operating conditions provide for strong heating or severe freezing , then the battery is unlikely to last long ( especially a phone fully charged and lying under a car glass in summer) .

Answer 17

With laptops from Sony there is a proprietary setting called "Battery Care". When it is turned on, the battery is charged no higher than a certain level (in the strongest care mode - 50%). After reaching this level, the battery does not charge (judging by the regular icon in Windows).
I use this function because the laptop in 99% of the time works from the network. It seems that the battery capacity has not decreased noticeably over the past 2 years (as it was before with other laptops, including those from Sony without this utility).
I'm not an expert on batteries, I don't want to say anything .. but, as they say, the conclusions suggest themselves.

Answer 18

There is a 100% answer to this question - everything is individual. In two identical gadgets, one of them may have a marriage. As a result, Vasya will constantly keep the gadget on a constant charge and calmly use the battery for more than one year, and Petya - once or twice and miscalculated.
In fact: I used a Sony Vaio laptop, 2 years old, 99% on charge, as a result, the battery lost only 1% of its capacity, sometimes hung at 99% and did not charge further. Now I'm using a Samsung Gaaxy Tab E tablet, the battery is new, like the tablet itself. Constantly on charge, but with one but ... There is an extension cord-surge filter, and when I use the tablet - I turned on the button on the extension cord, I do not use it and went away on business - I turned it off. As a result, it's always 100%, I put the tablet down at night, turn on the mode on the plane, after 8 hours of sleep - in the morning the battery is 100%.
The official instruction says - do not charge the battery for more than 1 week and power from the network when the gadget is working - is welcome. That's all, use...

Answer 19

Harmful. But not for the battery. And for the power controller. After some time, the phone will turn off even with a full charge. And when you turn it on, it will show a zero charge.