hi everyone Aaron here for ZolloTech and iPhone battery health is something that
I see in the comments more and more every time there's an iOS update people are
concerned that the update will degrade battery health and so I wanted to
explain how that's not true what battery health is and how it
actually works overall and then I'll show you the usage graph and explain
that a little bit because that can be a bit confusing as well now the first
thing is battery Health iPhone battery health is simply a measurement of the
overall capacity and health over time of the battery inside the phone a physical
measurement of the battery capacity so for an example I'll use my iPhone 11 pro
max that I have here and internally it has a 3969 milliamp hour battery and to
just make this a little bit easier I'm going to say it has a four thousand
milliamp hour battery so I'm just rounding to make the math a little bit
easier now as far as the battery capacity is concerned when you purchase
a new iPhone if it's an 11 pro max you'll have about 4,000 milliamp hours
after using it plugging it in and charging it then using the phone and
discharging the battery and then charging it back up what you're doing is
called cycling the battery every time you cycle a battery the physical battery
itself degrades now a full cycle constitutes as 100% battery drainage and
recharge so if one day you drain it down to say 50% then you charge it back up to
100 that's half a cycle then the next day you do the same thing 50% down back
up to 100 that's another cycle that would constitute as one full cycle so as
you cycle the battery over and over and over
whether that be charged to 80% or discharged to 40% that's still part of a
cycle and as you do that more and more those cycles will degrade the battery so
after two years Apple says you should have about 80% of your battery health
left so what that means to give you an example is if the iPhone 11 pro max had
four thousand milliamp hours it would now have 32 hundred million power
capacity or to put it in terms of an automobile in a car maybe you have a 10
gallon fuel tank after two years it be down to 8 gallons and you would only
be able to handle 8 gallons of fuel and no more
that's how batteries work and how they degrade over time so as they degrade
there's nothing you can do as far as bringing it back up to 100% without
replacing the physical battery itself so what happens is is every time you
install an iOS update your phone says what was the maximum capacity originally
and what is it now and so it says originally it was 4,000 milliamp hours
now it's a 3200 so it would give me an 80% here that's what it's actually
measuring every time and every time you install an update it's just simply
checking what the maximum was when it was new verse what it is now and giving
you a percentage number based on that and over time this will continue to go
down and it will stabilize around 80 or 70% and stay there for quite some time
but over time you will need to replace the battery if you continue to use the
same phone so the iOS updates do not degrade the battery health
they're simply remeasuring it and so for example on my iPhone 6s plus that I have
here I'm down to 85% and while it still is at 85% it's still performing well
enough to actually use it you'll see it says peak performance capability your
battery is currently supporting normal peak power performance and what that
means is as your phone actually degrades with the battery the battery does not
have the ability to push out the full amount of power that at once could so if
it's low enough that it can't do that it will then tell you that peak performance
is degraded and it's time to replace your battery because the actual phone
will slow down at that point otherwise if it didn't slow down it would just
fully reboot and this is true on Android phones it's true on any phone with a
lithium-ion battery or any battery for that matter so batteries just degrade
and until someone comes up with a better battery chemistry that doesn't degrade
over time that's what we're dealing with now as far as the usage over time this
is where it's a little bit confusing Apple changed this a few versions ago
and just to help you understand how this works a little bit better since I get
some questions about that you'll see over the last 24 hours I've had two
hours of screen on time and 21 minutes of screen off time
however this is also measuring screen on time while the phone is plugged in and
charging so you can see from here to here it actually discharged the battery
then you've got this little lightning bolt it charged the battery this is when
I went to bed I put it on a wireless charger it charged it
then it gets a little bit lighter as far as the graph goes and that's where it
was discharging again then it's darker again that's when I put it in my car to
drive to my office and then then I put it on a wireless charger in the car and
then again it's discharging right now and that's how that's measured over 24
hours so you could potentially have four hours or 24 hours of screen on time if
you left the screen on the entire time even though it's plugged in so it
doesn't technically measure the way it's actually using the battery but if you
leave your phone off a charger the entire time you'll see over the last 10
days it will show you what you've actually used now if it's not off the
charger this will include on the charger time so just keep that in mind
so yesterday for example I had 3 hours and 10 minutes of screen on time 1 hour
and 36 minutes of screen off time and you can see what actually used the
battery this was unplugged during that time and I know that because I left it
unplugged but I did not get that great a battery life so the top graph here will
actually show you your battery usage so 0 to 100% I used about 45% of my battery
to get the screen on and screen off time that I did so it varies depending on day
to day if I go to another day you'll see 4 hours and 45 minutes of screen on time
2 hours and 49 minutes of screen off time I used a little over 50% of my
battery that day depending on the day how you used your phone how your cell
phone signal was whether or not you used Wi-Fi will make these numbers vary
greatly and so battery usage is not straightforward as much as you might
think I would really like to see Apple say this is the amount of time it was on
battery this is the amount of time it was charged or being plugged in and then
we would have a more accurate and we could give you a finite number of
what's actually being used first what's the charge time so right now it's a
little hard to calculate but you can get an idea as long as you know for a fact
that it was off the charger so this day I used one hour and 41 minutes of screen
on time 53 minutes of screen off time but I only used a quarter of the battery
or 25% or so now when I always say in a video that if I times this by four I can
give you a general idea well one hour and 41 minutes of screen on time 53
minutes of screen off time in that time that I used one hour and 41 minute I
used about a quarter of the battery so times for ongoing 25 50 75 100 and
that's all I'm doing is timesing that by four so we'd get about eight hours of
screen on time with this particular update or this particular day but day to
day this will vary greatly whether or not I'm using Twitter whether or not I'm
using YouTube or playing a game it's going to make that change dramatically
depending on what I'm doing so hopefully that helps you understand this a little
bit better but I would really love for Apple to actually update this and say
here's how much power you used in in this day on battery here's how much the
screen was on when you weren't on battery but you were plugged in instead
so that would be a much more accurate measurement and a more finite
understanding of what's actually going on as far as battery usage but let me
know what you use as far as battery in the comments below I would love to hear
what your battery health is what your usage is and what you're experiencing on
not only new phones but older phones such as the 6s plus or even older I
would love to hear what you have to say in the comments below if you'd like to
get your hands on this wallpaper of course I'll link it in the description
below and if you haven't subscribed already please subscribe and if you
enjoyed the video please give it a like as always thanks for watching this is
Aaron I'll see you next time