iPhone download immediately On iPhones, there is a mysterious problem involving the battery. The problem is the percentage of the iPhone battery charge indicatorwhich can be completely stoned, go from 45% to 12% in one second or, vice versa, go from 18% to 43% one second after putting it on charge. In practice, the iPhone discharges immediately, even if theoretically it should have lasted longer, as if the battery had failed.

In other cases, it may happen that after keeping the phone charged all night, you pick it up in the morning and find it drained or almost empty. If we too are victims of a iPhone that downloads right away or showing a completely busted charge time, let’s see together how to calibrate the battery and make it last longer.

READ ALSO -> How to see the battery status on Android and iPhone

Optimize iPhone battery

In the past we have collected many tips for optimize battery life on iPhone so that it can last as long as possible. To get the maximum autonomy from your iPhone we recommend:

  • keep the iOS operating system always updated to the latest version;
  • check the apps that remain in the background and block the automatic launch of applications that consume too much energy (such as Facebook, TikTok and Instagram);
  • use the energy saving mode as soon as the remaining charge drops below 50%;
  • restart your phone once a week.

These simple tricks should allow you to reduce the power consumption of the iPhone. If despite these tips we notice that the iPhone runs out immediately, all that remains is to proceed with the battery calibration.

Calibrate iPhone battery

Many battery problems with the iPhone can be solved by doing one battery calibration. To calibrate the battery on iPhone you have to proceed in a scientific manner, following each step of the procedure below:

  • We unload the phone up to 1% and wait for the automatic shutdown due to lack of energy.
  • We try to turn it on and insist until we see the icon indicating the low battery appear.
  • Let’s put it on charge, wait for the device to start and wait for it to charge completely, without logging in on the iPhone.
  • At the end of the charging process we wait 5 minutes and remove the power cord.
  • Now let’s turn off the iPhone, wait 5 minutes and try to start it. If the charge level is different from 100%, we repeat the calibration procedure from the beginning.

After battery calibration, the percentage indicator on the iPhone should be aligned with the actual charging situation, albeit however, we can expect a drop in performance if at least two years have passed since the purchase of the iPhone.

Do iPhone lithium batteries run out earlier?

About lithium-ion battery of smartphones it can be interesting to understand how they work and how complex they are, also in order to make them last longer in general. Each lithium-ion battery is composed of lithium and cobalt oxide plates for the positive cathode and negative carbon electrodes, with perforated separators between them, wrapped in narrow overlapping spirals.

During charging, ions move in the direction of the negative electrode while during discharge, they move in the direction of the positive electrode. Lithium batteries are lighter than nickel-cadmium batteries of old and offer more energy density, although they have the disadvantage of degrading even if not used, losing about 5% of their charge capacity each month (for this if you buy an old smartphone that has been on the market for years, you could end up with a battery that already lasts less than its initial potential).

Lithium batteries last longer if they are never fully discharged; to be able to use an iPhone well, we therefore recommend that you always charge the phone when it reaches 30% charge and remove it immediately (within the first 15 minutes) from the end of the charging process, so as to preserve the number of charge cycles provided by the battery and avoid overcharging.

These and other recommendations have already been described in the guide on how often to charge the battery to extend its life.

Does the iPhone slow down due to the worn out battery?

As has been amply demonstrated in the past in the event of a very bad battery, the iPhone will tend to slow downsince it will compensate for the shorter battery life with a lower processor frequency; if we particularly care about an iPhone, the advice is to always change the battery every 2 yearsso as to maintain the optimal performance of the CPU and the integrated battery.

To change the battery we can contact the Apple Stores or R-Stores in Italycarrying out the operation under warranty or out of warranty (in the latter case there will be a cost to pay, but it will certainly cost less than a new iPhone).


The detection percentage on modern smartphones can be wrong as it is often a relative indication: if on a new phone 100% indicates a duration of 24 hours, after a few years, 100% no longer indicates the level of charge that can be reached at the beginning of the life cyclesince in this case it will last much shorter.

The percentage of battery life that we see is then, in reality, only an estimate The only information that a phone or laptop can use to calculate the percentage of remaining charge, in fact, is the battery voltage, but there is not necessarily a 1-to-1 correspondence between the cell voltage and the amount of energy. remaining inside. Temperature, battery degradation, and the amount of power being processed are factors that can affect that estimate by making it wrong.

To learn more we can read our guides on how to get an old and slow iPhone back fast and how speed up iPhone and optimize iOS.


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