Battery Health Capacity Dropped

Dont fully charge iPhone charge maximum upto 80 percent and don’t charge with fast charger in hot environment

Until your battery drops below 80%, it is fine. My suggestion is to stop worrying about it.

You cannot compare the functioning of two entirely different models of phone.

Hello, I had the same issue on iPhone 11 Pro after the latest update. the problem was solved by the following :

1- full iCloud backup

2- reset all content on iPhone

3- restore iPhone iOS from laptop

4- restore the iPhone data from iCloud backup not laptop

the battery health came back 100%

Hope it works fo you.

Mac_slide wrote:

I use what apple gave me the fast charger and it has so far from day one not changed off 100%

We're seeing normal variations, including some that (when interpolated into midway points) don't seem all that far off from Apple's specified battery performance of 80% after 500 cycles. I certainly don't sense that there's anything more than normal variations, with a few exceptions. Many of the complaints I see posted in this topic (including posts asking for a new device) on their face seem to be complaints that they're not vastly exceeding the performance that others have seen.

As for fast charging, that's been going on to some degree for a while. While iPhones only came with a 5W "cube" for years, many were using higher power adapters or via Macs (I believe up to 2100 mA for USB-A and now 2400 mA for USB-C) for years and not noticing any accelerated decline. When going over 80% and then approaching full charge, the power management system always reduces the charging current. This is absolutely needed to obtain as full a charge as possible and to prevent the battery from overheating.

Call Apple support and ask them to do a remote diagnostic on your phone. This will tell you your battery charge cycle count. My battery charge cycle count was 171 and that resulted in a 98% battery capacity in about a 3-4 month period. After you get your battery charge cycle count, then you will know if your battery has a problem or not. If you have a Mac, you can download coconut battery and get the same info from that if you ae lazy to call Apple support.

Download coconut battery on your Mac or call Apple support to run a remote diagnosis. Both will allow you to find your current number of charge cycles on the battery. Then you can gage whether your current battery capacity is normal or not.

Today apple service call to me, he run diagnostic test, he say yes you have 99% its very ok, why? beacouse this is first run of iPhone and he can dropes 1-2% battery!

He says when battery droped to 95% you can drive to service..

I have 11 cycle.. ;(

It's not a live battery health status like with Mac notebook computers. It seems to update periodically after reassessing battery health. The most important thing is that it's an estimate and that estimation model can jump with all sorts of inputs. Especially when a battery gets older, it's just a guess really.

They may in fact have changed the algorithm and may do so again. It is not a precise measurement of the battery, it is a snapshot of the battery at the time you checked it and it can vary by time, charge level, current usage of the phone, temperature, environment, etc. None of the posts here show a problem with the possible exception of your iPhone 7. It may indeed have a battery problem, you should get it tested.

I am afraid it does. For example, with a lithium ion battery, the normal max voltage is 4.2 volts, and this is the figure used for the 300 to 500 life cycles. For every 0.1 volt less than that charged, the cycles approximately double, so if for example you only charged the battery up to 3.9 volts, (as is the case with my Iphone 7), you get up to 4000 cycles.

If you fast charge your battery enough to get hot, lithium spikes are formed, which in a worse case, can cause damage that can be fatal to the battery.

Apple appear to reduce the maximum you can charge your battery as already mentioned by a senior poster, (same with the minimum), to increase the life of the battery, but I puzzle as to why they still quote the base health on an expected 500 cycles, but then I do not know enough about the BSM in each model.

All this means that Apple stop your battery discharging past a figure they have deemed safe, and up to a figure they think will maximise the life of the battery, and if it is 3.9v, then it is highly likely in the thousands of cycles, not 500, but if it is 4.2volts, then by you not fully charging it, you will add life, but either way, reducing the upper charge level adds life. To monitor the health of the battery, perhaps the algorithm is not taking the peak voltage charged to into account? This by the way reduces the usable capacity of the battery, hence the need to charge it more often.

What is going in here 😳.

On a serious note after the advise given in this thread the only change ive made is reduced the use of fast charger to keep the heat down. Back to good old 5w and only fast charge as and when needed.

Lithium Ion Batteries are a consumable product. Despite you having a brand new phone, the battery inside could be quite old. Non-Apple branded fast chargers can degrade the battery faster than genuine chargers. It is always good for a battery to reach either end of the voltage scale (0% - 100%). Leaving phones on a charger constantly will degrade the battery inside.

If you are experiencing problems with performance or battery life, it is recommended to bring your phone for a service at an Apple Store or an Authorised Apple Service Provider.

FarMuf wrote:

Lithium Ion Batteries are a consumable product. Despite you having a brand new phone, the battery inside could be quite old. Non-Apple branded fast chargers can degrade the battery faster than genuine chargers. It is always good for a battery to reach either end of the voltage scale (0% - 100%). Leaving phones on a charger constantly will degrade the battery inside.

While I do agree that batteries are consumables, the rest of what you state isn’t correct. As long as a power adapter is well regulated for voltage, it’s really just a voltage supply. The actual charging circuits are in the device and not the power adapter. An Apple 12W power adapter is no better or worse for an iPhone than a quality non-Apple 12W power adapter.

I have no idea what you mean by “voltage scale”. I don’t particularly believe there’s a problem with reaching any particular charge, but there’s no particular need to get to 0%.

Leaving it connected to power is fine. It won’t overcharge and typically stops charging when full. It will then allow the charge to drop before charging to full again. All of this is transparent to the user where it will just show 100%, but tools like coconutBattery or iMazing will show a more accurate representation of the state of charge. There are some who use a charging case almost all the time, and the battery barely loses capacity because it goes through very few actual charge cycles. But that’s trading off the life of the charging case battery to keep the internal battery from racking up cycles.

kanishka162 wrote:

I purchased the iPhone 11 Pro Max in last December 2019.So the battery health was at 100% but as of today, it dropped 3 percent. it mean 97%.

What is the solution for this ?

As it is not a problem, there is no need for a solution. It's perfectly normal.

These batteries wear down the more cycles you have. For lithium battery it’s optimum to keep them between 90% to 60% max. Keep it topped up as much as you can and don’t let it go to low battery levels as this kills the battery.

This is the only way to keep your battery healthy.

Otherwise this phones are designed to last the warranty with full cycles and then battery will degrade and you have to either buy a new battery or replace the phone!