[Electronics-Talk] FW: [GTTsupport] How iOS 13 Will Save Your iPhone’s Battery (by Not Fully Charging It)

Wed Jun 19 00:50:12 UTC 2019

Madison, I think you keep bottom posting.  Because I don't see a message 
from you.  I just see the copy of the message that should probably have been 
under yours.  Pam.

-----Original Message----- 
From: Madison Martin via Electronics-Talk
Sent: Tuesday, June 18, 2019 3:07 PM
To: electronics-talk at nfbnet.org
Cc: Madison Martin
Subject: [Electronics-Talk] FW: [GTTsupport] How iOS 13 Will Save Your 
iPhone’s Battery (by Not Fully Charging It)

From: GTTsupport at groups.io [mailto:GTTsupport at groups.io] On Behalf Of Debbie 
Gillespie
Sent: June-18-19 5:47 AM
To: GTTsupport at groups.io
Subject: [GTTsupport] How iOS 13 Will Save Your iPhone’s Battery (by Not 
Fully Charging It)

A simple way to charge batteries. iPhone. iOS 13. Will keep your battery at 
80%. But it’s good in the long run.
https://www.howtogeek.com/423451/how-ios-13-will-protect-your-iphones-battery-by-charging-to-80/

How iOS 13 Will Save Your iPhone’s Battery (by Not Fully Charging It)

<https://www.howtogeek.com/author/joshhendrickson/> Josh Hendrickson 
<https://twitter.com/canterrain> @canterrain
June 4, 2019, 8:00am EDT

<https://www.shutterstock.com/image-photo/riga-latvia-march-25-2018-latest-1054927793> 
Kaspars Grinvalds/Shutterstock

Lithium-ion batteries, like those in iPhones, have a longer usable life if 
you don’t charge above 80%. But, to last the day, you probably want a full 
charge. With iOS 13, Apple may give you the best of both worlds.

iOS 13 Will Charge to 80% and Wait

Apple announced  <https://www.apple.com/ios/ios-13-preview/> iOS 13 at WWDC 
2019. Buried in the  <https://www.apple.com/ios/ios-13-preview/features/> 
list of extra features was a note about “battery optimization.” Apple says 
it will be “reducing the time your iPhone spends fully charged.” 
Specifically, Apple will prevent your iPhone from charging above 80% until 
you need it.

You might be wondering why Apple wants to keep your iPhone at 80% charge. It’s 
all about the way Lithium-ion battery technology works.

Lithium-ion Batteries Are Complicated

Apple

Batteries, in general, are complicated technology. The fundamental goal is 
to cram as much energy as possible into a small a space as possible, then 
safely release that energy without causing a fire or explosion. It’s a 
juggling act of priorities.

Lithium-ion batteries make things extra complicated by being rechargeable. 
Earlier rechargeable technology suffered from the memory effect—essentially, 
batteries lost track of their maximum capacities if you constantly recharged 
them after only partially discharging them. Lithium-ion batteries don’t have 
that problem. If you’re still draining your battery to empty before 
recharging it, 
<https://www.howtogeek.com/169669/debunking-battery-life-myths-for-mobile-phones-tablets-and-laptops/> 
you should stop. You’re damaging your battery’s health.

RELATED: 
<https://www.howtogeek.com/169669/debunking-battery-life-myths-for-mobile-phones-tablets-and-laptops/> 
Debunking Battery Life Myths for Mobile Phones, Tablets, and Laptops

You Shouldn’t Keep Your Battery at 100%

One cycle consists of depleting an amount that adds to 100%. Apple

Lithium-ion batteries charge to 80% faster than previous battery 
technologies did. For most people, 80% is enough to make it through the rest 
of the day, so it gives you what you need sooner. It also doesn’t have the 
dreaded “memory effect” that causes the battery to lose track of its full 
capacity.

However, instead of having a memory issue, Li-ion has a maximum charge cycle 
issue. You can only recharge the battery so many times, and then it starts 
to lose capacity. It’s not merely charging zero to 100% that counts as a 
full charge. If you charge from 80 to 100% five days in a row, those 20% 
charges add up to one “full charge cycle.”

Not only does draining the battery to zero and then charging to 100% hurt 
your battery in the long run, always charging the battery isn’t good for it 
either. By staying near 100%, you risk overheating the battery (which can 
cause damage). Additionally, to prevent your battery from “overcharging,” it 
stops the charge for a while, then starts again.

That means if you charge your device overnight after it hits 100%, it drops 
to 98 or 95%, then charges back up to 100%, and repeats the cycle. You’re 
using your maximum charge cycles without even actively using the phone.

The Solution: The 40-80 Rule

For all these reasons and more, most battery manufacturers will recommend 
the “40-80 rule” for lithium-ion. The rule is straight forward: try not to 
let your phone deplete too much (less than 40%), which can damage the 
battery, and try not to keep your phone charged entirely (more than 80%) all 
the time.

Either scenario is made worse by weather, so if you want your battery to 
retain its full capacity longer, keep it around 80%.

iOS 13 Sits at 80% During the Night

Recent iOS updates include a 
<https://www.howtogeek.com/254739/how-to-check-your-iphones-battery-health/> 
battery health feature the let you check on your battery capacity, and see a 
history of your battery usage. The feature is a useful way to know if you’ve 
stuck to the 40-80 rule.

But Apple knows you don’t want to start the day around 80%. If you travel a 
lot or otherwise find yourself frequently out of reach from an outlet, that 
extra 20% can easily be the difference in whether your iPhone makes it to 
the end of the day. Staying at 80% risks losing a valuable asset, your 
phone. That’s why the company wants to meet you in the middle.

In iOS 13, a new charging algorithm will keep your iPhone at 80% when 
charging overnight. That algorithm will determine when you typically wake up 
and start the day, and restart the charging sequence to give you fully 
charged battery when you wake up.

That means your iPhone won’t spend the entire night taking a charge it doesn’t 
need (and risk overheating), but when you start your day, you should have 
100% battery charge. It’s the best of both worlds to give you as long as 
battery life as possible, both in retaining the full capacity of the battery 
and making it through the day.

RELATED: 
<https://www.howtogeek.com/254739/how-to-check-your-iphones-battery-health/> 
How to Check Your iPhone’s Battery Health

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