Ashlei Temeña’s family trip to Disneyland last Thanksgiving break turned into a nightmare when her smartphone battery hit empty.
Ms.
Temeña, a San Francisco support technician, had gotten separated from
her family and realized she had no way to find anyone. Instead of riding
roller coasters, she wandered around searching for the group —
eventually locating them four hours later watching fireworks.
“It sucked really bad,” Ms. Temeña said. “I wanted to throw my phone on the ground by the end of the day.”
Many
consumers can relate. Despite the leaps forward in mobile phone
technology with crisp, clear screens and faster chips, batteries have
made only sluggish progress. That has propelled a desire for stronger
battery life to the top of the list of factors considered by consumers
when they purchase smartphones, according to a 2014 survey by the
research firm IDC.
So why is battery technology still underwhelming? Plenty of companies have been developing
for years, including methods to increase battery capacity tenfold or
charge devices by pulling energy from the air. But lithium ion, the
technology that most mainstream batteries are based on, is low cost and
easily reproducible while being safe — so we’ll be stuck with it for the
foreseeable future, said Charlie Quong, an executive at Mophie, the
battery accessory maker, in an interview.
“There’s
a lot of investments on all fronts for improving the technology above
and beyond that, but I don’t think we’re going to see that hitting any
kind of mass market for several years out,” Mr. Quong said. In general,
lithium ion improves about 10 percent a year in terms of the amount of
energy that can be stored in a given space, which is partly why
consumers perceive batteries as being far behind other technologies.
With that backdrop in mind, we teamed up with,
the product recommendations website, to run an array of tests to
determine best and worst practices for preserving battery life on
smartphones. For those who still need extra juice, the Wirecutter also
picked some external battery products.
The
results showed that some conventional beliefs about extending battery
life — like turning off Wi-Fi or shutting down all your phone’s apps —
produced negligible or even harmful results. The Wirecutter also found
plenty of helpful practices to get more use out of your battery, like
playing music stored directly on the device (instead of streaming it) or
tweaking email configurations.
The
Wirecutter tested a range of recent Apple and Android smartphones with
the latest operating systems in tightly controlled environments. Your
phone’s results will vary depending on the phone model, cellular
carrier, location and other factors, but the general results should
hold. Here are eight tips and seven myths busted by our findings:
1. Use auto-brightness for the screen.
A
smartphone’s screen consumes more energy than any other component, so
the easiest way to cut down battery drain is to reduce your screen
brightness. In an hourlong test, an iPhone 6s used 54 percent less
battery power with the screen brightness at minimum as compared to
maximum brightness. An Android test phone used 30 percent less.
But
it’s tough to use a dim screen in bright environments, so most phones
offer an auto-brightness mode that automatically adjusts the screen’s
brightness based on ambient light. The Wirecutter found that enabling
auto-brightness saved a good amount of battery life.
2. Block power-sucking ads.
When
browsing the web, your smartphone also burns through power when it
downloads mobile ads on websites. Installing an ad blocker will greatly
extend battery life.
The
Wirecutter ran a test that cycled through a list of websites for two
hours over a Wi-Fi connection. Safari on an iPhone 6s used 18 percent of
a full battery; Chrome on a Moto X Pure Android phone used 22 percent.
Installing the ad blocker on the iPhone reduced battery usage for the same test to
only 9 percent of a full battery; on an Android phone, using the which blocks ads, used only 8 percent of the battery.
3. Tweak your email settings.
Email
can have a major impact on battery life if you have multiple email
accounts and receive lots of email. Your smartphone can update your
email automatically using a technology called push, which brings new
messages to your phone the instant they are transmitted. Push can be a
power hog because it requires your phone to constantly listen for new
messages, so if you get a lot of email, there’s a good chance your phone
is using lots of energy.
The
Wirecutter tested an iPhone 6s Plus configured with three email
accounts, receiving a total of 20 to 30 messages an hour. In these
tests, having push active over the course of a day caused Mail to
consume 5 to 10 percent of the phone’s overall battery use.
To
save energy, most phones can be configured to instead check for (or
“fetch”) emails on a schedule — say, every 30 minutes — or only when you
manually tell your email app to refresh.
4. Play downloaded music instead of streaming.
The
next tip may come as unwelcome news. Nowadays, online streaming is the
most popular way to listen to music, with services like Spotify, Pandora
and Apple Music — but this method guzzles lots of battery power. In the
Wirecutter’s tests, streaming music over a Wi-Fi connection for two
hours used 10 percent of an iPhone’s battery reserves; streaming the
same music stored directly on a device over two hours consumed only 5
percent.
Fortunately,
streaming services like Spotify and Apple Music still let you listen to
songs the old-school way: by storing the music straight on your device.
5. Turn off wireless when reception is poor.
You
may have noticed that when you’re in a place without good Wi-Fi or
cellular coverage, your phone’s battery seems to drain much more
quickly. That’s because the phone uses energy searching for a good
signal and, if the signal is very weak, trying to get a better
connection.
To conserve
battery life, disable the phone’s wireless circuitry. Airplane Mode, an
option that will turn off all wireless features, is a quick and easy
solution in areas with poor reception.
Alternatively,
you can disable (in your phone’s settings) a single wireless feature.
For example, if you have terrible wireless carrier coverage in your
office, but Wi-Fi is great, disabling cellular connectivity while there
will keep the phone from wasting energy trying to get a cellular
connection while still letting you connect to the Internet over Wi-Fi.
6. Check the battery usage lists.
Consumers
can get even better results with a bit of sleuthing. Both the iPhone
and Android systems provide a simple way to see which apps are using a
lot of battery power. For iPhones and Android phones, open the Settings
app and in the Battery menu, there are sorted lists of apps that are
using the most energy.
On
iPhone’s battery usage screen, tap the clock button to reveal
information about how much of your battery life each app is consuming
when you’re actively using the app (“screen”) compared to when you’re
not (“backgd”). On Android, the most useful information are the timers
for “CPU total” and “CPU foreground.” Foreground is how much time you
had the app open; subtract “foreground” from “total,” and you’ll know
how much time the app has been busy in the background.
Be
on the lookout for apps that are active for extended periods in the
background and are using a lot of battery power. Examples include an
email app that spends lots of time checking for new messages even when
your phone is asleep, a news reader that updates articles in the
background or a fitness app that constantly monitors your location.
If
you find apps using up lots of energy in the background, disable their
background activities. On an iPhone, go to the Settings app, tap General
and then Background App Refresh and disable the background activities
for any apps. On Android, go inside the Settings app, tap Data Usage,
choose an app, then select “Restrict Background Data” for background
data usage.
7. Disable unnecessary location tracking.
Watch
out for apps that track your location. Your phone’s GPS circuitry,
which determines your geographic location for mapping and fitness
features, A run-tracking program that monitors your precise location for the duration of an hourlong run will lower your battery level.
If
a location-based app is using a lot of power, especially in the
background, there’s a good chance the app is using GPS, Wi-Fi and the
phone’s sensors frequently. You can decide whether to disable location
features for it (either via your phone’s Location Services settings, or
by changing settings in the app itself). On an iPhone, you can disable
the app’s ability to track your location by going to Privacy menu and
Location Services.
To disable
location tracking on Android, go inside the Settings app, tap Apps,
choose an app and select “Permissions,” then tap to disable Location
permission.
8. Shut off unnecessary push notifications.
Both
Apple and Google recommend disabling push notifications, which are
essentially app alerts, to conserve battery life. Notifications require
regular communication with notification servers, and each notification
causes your phone to wake up for a few seconds, including turning on the
screen, to show you a message and give you a chance to act on it.
In
the Wirecutter’s testing, receiving a few dozen notifications over the
course of an hour didn’t noticeably affect battery usage. But if you get
a lot of notifications each day, that energy use can add up. If a
particular app or service (say, Twitter or your email client) is
constantly producing notifications, consider disabling notifications for
that app.
On an iPhone, open
the Settings app, tap Notifications, tap the app name and disable Allow
Notifications. On Android, disable notification in an app’s settings
menu, or long-press the notification itself and select the “i” icon.
This will send you to that app’s App Notifications settings, where you
can block all notifications.
Beware battery-saving myths.
1. Closing unused apps.
There
is plenty of inaccurate conventional wisdom about methods to prolong
battery life. Let’s start with one of the worst “tips”: Closing (or
force-quitting, as it’s commonly called) apps you are not currently
using. The theory is that apps running in the background are using your
phone’s components, so quitting them will save energy.
While
that may be true on a computer, smartphones are designed differently:
Once an app is no longer in the foreground — meaning you are not
actively using it — most or all of its processes are frozen. In other
words, while an app may still be loaded in a phone’s memory, it probably
is not doing much in the background to drain your battery.
Finally,
quitting apps actually has drawbacks: When you force-quit an app, all
of its code can be purged from your phone’s RAM, which means that the
next time you open the app, the phone has to reload all of that code.
That, of course, requires energy.
2. Don’t assume turning off Wi-Fi will always help.
A
common suggestion for extending battery life is to disable Wi-Fi.
However, if you’re in range of a strong Wi-Fi signal, your phone uses
less energy to connect to the Internet with a Wi-Fi connection than a
cellular one. If you regularly use apps that rely on your location,
having Wi-Fi enabled helps your phone determine its location without
having to rely solely on power-hungry GPS features, so it actually helps
a battery last longer.
An exception is when you’re at the edges of a Wi-Fi network, where your phone is struggling to get a good connection,
and you have a good cellular data connection. But in most cases, you’re usually better off keeping Wi-Fi enabled.
3. Avoid disabling all location services.
Many
apps that use your location do so only intermittently. Even using the
Maps app for short navigation sessions doesn’t use more than a few
percent of your battery’s capacity — and having the phone’s screen
continually on is a big part of why navigation uses a lot of power.
In
other words, don’t disable all of your phone’s location-based features
just to extend your battery life. You won’t see a big jump in use time,
but you may end up disabling — and subsequently missing — useful
features. Instead, check (using the tips above) to see if any of apps
consuming the most battery life also track your location. If so, and if
you don’t need that location tracking, consider disabling it for those
apps.
4. Don’t always choose Wi-Fi over cellular.
Many
people, and even smartphone vendors such as Apple, claim that using
Wi-Fi for wireless data consumes less power than using a cellular
signal, so you should use Wi-Fi whenever you can. However, the
Wirecutter’s testing found this isn’t always the case.
In
testing in a location where both Wi-Fi and cellular LTE signals were
strong, an hour of browsing over Wi-Fi used roughly the same amount of
battery power as an hour using LTE on an iPhone. On a Motorola Android
phone, LTE used only 2 to 3 percent more power than Wi-Fi.
In
other words, as long as you have a good signal, you probably won’t see a
huge difference between Wi-Fi and cellular data, and it’s probably not
worth the hassle of switching between the two.
5. Let Siri and Google listen for your commands.
Both
iPhones and Android phones include a hands-free feature for summoning
their virtual assistants by speaking voice commands. You can just say
“Hey Siri” to the iPhone or “O.K. Google” and then speak your request or
command. While convenient, this feature requires your phone to
constantly listen for that special phrase, which uses some power.
Yet
if you have one of the phones that supports this feature, disabling it
won’t conserve much battery life. In the Wirecutter’s testing with an
iPhone 6s Plus and a Nexus 6P, there was a negligible difference in
battery usage between having the always-on virtual assistant enabled or
disabled over a two-hour period.
Using
Siri or O.K. Google uses some energy, so if your phone’s battery is
getting low, you should probably stop asking the phone question after
question during your commute. But just having the feature enabled isn’t
worth worrying about — and it can be quite convenient.
6. Don’t forgo third-party chargers made by reputable vendors.
A
common warning around the Internet is that you should use only the
charger that came with your phone, otherwise you could damage your
phone’s battery. In reality, the phone itself contains all the circuitry
responsible for charging its battery. The AC adapter (as it’s more
accurately known) simply converts the AC current from a wall outlet into
low-voltage, low-amperage DC current that it provides via a USB port.
This is why you can also charge your phone using the USB port on a
computer, a USB battery pack or a charger in your car — the phone is
designed to allow it to charge from a variety of power sources that can
produce a wide range of current.
Finally,
you may see warnings that a cheap third-party charger could damage your
phone. There’s some truth here: Many chargers — especially budget
models sold online, or even at your local shopping mall kiosk — are
poorly made, or use low-quality components. A poorly made charger can
not only damage your phone, but could also hurt you by exposing you to
dangerous currents. So if you’re replacing your phone’s AC adapter, or
buying an extra, stick with a reputable vendor.
7. Calibrate only occasionally.
For
many years, devices that used rechargeable batteries required
“conditioning” or “calibrating,” a procedure that prevented the battery
from forgetting how much capacity it actually had. Today’s smartphone
batteries no longer suffer from this issue.
What
can happen, however, is that the phone itself loses track of how much
capacity its battery has: Every battery gradually loses capacity over
time as you use and recharge it, and the phone’s software isn’t always
good at accounting for this capacity change. By periodically (once every
couple of months),
your phone’s software will determine the battery’s current capacity and
thus let the phone better estimate how long it will last on a charge.
In other words, the battery won’t last any longer, but the phone’s
battery meter will be more accurate. If you find that your phone claims
you have 80 percent of a charge left, but it dies a few hours later, you
should try this procedure.
If all else fails …
If
you have tried all the above and still struggle to get through the day
with your battery, consider buying an external battery. These
accessories — which can take the form of a bulky case with a built-in
battery that you wear on the phone, or a separate battery pack that
connects to your phone with a cable — can provide power to last an
additional few hours at the end of the day, or even to fully charge your
phone’s battery.
The
Wirecutter tested more than 100 external batteries for dozens of hours
to pick a few favorites. Its favorite battery case for the iPhone 6 and
6s is
which has enough power to fully charge a dead iPhone and then some,
more than doubling the phone’s battery life. For larger iPhones — the 6
Plus and 6s Plus — the Wirecutter prefers because the case’s two-piece design makes it appealing.
For Android phones, an external battery pack is a good option. The
is the best pack the Wirecutter tested that will fit in your pocket
with your phone, and it’s less than $10. A great battery pack for the
iPhone is the, which is almost thin enough to fit in a wallet — with a built-in Lightning-connector cable to charge your phone.
For days of smartphone power, the
is the Wirecutter’s pick if you need to charge a phone repeatedly or
keep a full-size tablet and phone topped up through a busy week. It has
enough available power to charge a typical smartphone five times or to
fill a large tablet such as an iPad Air almost twice — for under $40.
After
her stressful day at Disneyland, Ms. Temeña bought an external Amazon
battery pack. She said the pack could fully charge her phone six times,
but it wasn’t ideal because of its bulk. Ultimately, she wishes her
iPhone had a better battery.
“I
don’t understand why a battery wouldn’t be able to keep up with all the
other advances they’re putting into phones now,” she said.
Read More
