IIRC once the battery hits 100% while plugged in, the charger inside the phone cuts the current to the battery and the phone will continue to run off the charger's current. I have always left all of my phones charging overnight every night and they never suffered from any problems, so no it's not bad for the battery.
It will charge to 100%, stop charging, drop to 99% and then start charging again. This constant cycle won't do any harm as such, but it will reduce the longevity of your battery.I leave my phone on the charger all day at work (oddly enough to reduce battery cycles) and as a result of that and charging it each evening it's rarely below 50%. I assumed it had a way to just switch over to USB power once it was topped up, but that periodic top up makes sense. Hopefully I'm not doing harm, there's a lot of battery theories out there as you know.
That 5% discharge is if switched off.The battery "self discharges" like 5% per month. So it won't drop be dropping to 99% overnight while it's plugged in. Apple has a threshold set on this number specifically to prevent the battery from constantly trickle charging (and increasing charge cycles like you said). So if you leave it plugged in for a month then maybe it will have to "top it off" but otherwise the battery neither charges or discharges once it hits 100%.
That 5% discharge is if switched off.
Sometime if I knew the next day I would be home most of day (weekends), I don't plug it in at all. At end, The battery give me more than a day for over a year.
It will charge to 100%, stop charging, drop to 99% and then start charging again. This constant cycle won't do any harm as such, but it will reduce the longevity of your battery.
Mind you, so does using it off the mains and then recharging. You can't win really but I would refrain from constantly topping it off.
Whenever I get a new iPhone, I like to charge it full then drain it full to 0% at least 4-5 times to help push the longevity. Then I only plug it in at nights. Sometime if I knew the next day I would be home most of day (weekends), I don't plug it in at all. At end, The battery give me more than a day for over a year.
I don't understand... it's called MOBILE phone, so people can use it without a cable. Why should it be always plugged in anyway?!
For some carrying their phone with them is not needed or required. If you sit at a desk all day or at home and do not need to have you phone on your person.
In these cases the battery would avoid as many cycles by leaving it plugged in while a power source is available. I do the same with my MacBook Pro and mostly use it when the power is available, so to save from having additional cycles on the battery, I plug it in. You should too but it is all up to your.
I once ran a laptop connected to the mains 24/7 and never used the battery. 18 months later when I did try to use it the battery was shot. It held a charge for 20 mins and ever since then I have charged my laptop, used it on battery power until empty and then charged it again. Almost two years later it still lasts for several hours on battery power.
Based on that experience alone I choose not to leave battery-powered devices connected to the mains for any considerable periods of time. Once charged I disconnect them from the mains supply.
Do we have documented proof that this is indeed what happens? Has anyone checked their battery cycle count and then left their iDevice connected to the mains for a couple of days (whilst using it too) before checking the number of cycles again?
No, but common sense would indicate that if you had two iPhones sitting next to each other and one was plugged in all day while the other was unplugged for 12 hours a day before charging, the unplugged phone would have MORE cycles accumulated after a week. Would you not agree to that?
If that is so and there is a limited number of charge cycles on a set of batteries before they needed to be replaced . . . . .
Macbook batteries work this way. My macbook is plugged in 99% of the time and it now has a couple hundred charge cycles on it (it has seen maybe a dozen charge cycles off power if I had to guess). I don't see why an iPhone should be any different.I wonder that too. Not so sure the battery could count 100 small steps into being a full cycle.
Macbook batteries work this way. My macbook is plugged in 99% of the time and it now has a couple hundred charge cycles on it (it has seen maybe a dozen charge cycles off power if I had to guess). I don't see why an iPhone should be any different.