Using Extreme Power Saving Mode on the HTC One M8

What Extreme Power Saving Mode is and how it can help you make the most of your HTC One M8's battery life

The HTC One M8 may have more than average battery life for a smartphone of its size, but that doesn't mean we won't run into situations where we can't get to a charger and we're running low on battery life. For that, there's Extreme Power Saving Mode. This feature can help you conserve as much battery life as possible, hopefully until you can get to a charger again.

How to enable regular Power Saving Mode on the HTC One M8

The HTC One M8 comes with two different battery saving modes. The first is regular power saving mode. This mode does not restrict what apps you use and simply attempts to conserve battery by monitoring CPU usage, display brightness, and a few other features that typically consume more than average amounts of battery. Enabling this mode all the time if you use your HTC One M8 heavily isn't a bad idea.

  1. Swipe down from the top of the screen with two fingers to access the quick settings menu.
  2. Tap on Power Saver in order to toggle it on.

How to enable Extreme Power Saving Mode on the HTC One M8

  1. Swipe down from the top of the screen with two fingers to access the quick settings menu.
  2. Tap on the menu button next to Power Saver Mode.
  3. Tap on the back button at the top to return to the Battery Manager screen.
  4. Turn On the option for Extreme Power Saving Mode.
  5. Tap OK on the popup warning explaining what Extreme Power Saving Mode is.
  6. You're now in Extreme Power Saving Mode. Tap Exit when you want to go back to using your HTC One M8 like normal.

When enabled, Extreme Power Saving Mode on the HTC One M8 will restrict your usage to the following 5 core apps:

  • Phone
  • Messages
  • Mail
  • Calendar
  • Calculator

Extreme Power Saving Mode focuses on conserving the maximum amount of battery life possible which is why it limits app usage. This is a great feature to use when you're running low on battery life and can't get to a charger for a while. I've enabled it when I'm below 20% and managed to squeeze a few more hours of usage out no problem. Just be mindful that you won't be able to do things like tweet or Instagram photos of your food while in Extreme Power Saving Mode.

Have you used Extreme Power Saving Mode on your HTC One M8 yet? How has it worked out for you? Did you get the results you needed or did it fall short? Be sure to let me know in the comments!

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Reader comments

Using Extreme Power Saving Mode on the HTC One M8

31 Comments

A serious question.. how does black/white power usage differ from color screen when using same brightness for LCD? Unless it's an AMOLED, I find this to be useless...

Posted via NEXUS 5

Unless I'm missing something, it doesn't say that it does. It's got a very different launcher that probably uses less memory and less CPU time (and taking background images out of memory would be a part of that). Plus it looks very different to help remind you that you're still in that mode.

The M8 does not turn into grayscale in power saving mode , as it is an LCD Display grayscale does absolutely nothing to preserve battery like it does on the S5.

Both a plus and a minus I guess, you get to see all colors but you won't save any power in the display aspect.

Posted via Android Central App

I doesn't. It just happens that the phone in the picture is using the black theme so the image looks grayscaled; notice some icon details are still in color. Other themes will have other colors during extreme power saving mode

I believe it's coming in a separate update so should be soon didn't come preinstalled on my wife's m8 on Rogers but received the update with bug fixes,camera improvements and this extreme power saver

Posted via Android Central App

Well we had to remove some stuff from whatever you offer because we are Verizon. We decided to take out the ultra power saving mode.

Posted via Android Central App

Actually, it wasn't available on the M8 from any U.S. carrier at launch. It's been enabled with updates. But like usual, Verizon just hasn't approved the update yet.

Neither power saving mode is available on Verizon yet unfortunately.

Posted via Android Central App

That was a big reason I got the s5 from Verizon I'm a pretty heavy user

Posted from my Nexus 7 2013 or Samsung galaxy S5

The normal power saver feature is in fact available on the Verizon M7 and M8 it defaulted to On but for whatever reason Verizon decided to block the icon from appearing, If your rooted you can download an app called SQLite Editor and you can actually enable the feature and show the icon like any other M7 or M8. The Extreme Power Saver feature though is not included at all in either the M7 or M8 on Verizon :(

Not if you're stock, but I have both modes running on my rooted S-OFF Verizon M8 and they run fine. I generally run the phone all the time in regular power save mode (and get 12+ hours with average use on a charge). Extreme powersave would probably extend that another few hours or more, but I haven't tested it.

It should also be pointed out that you can set EPSM to come on automatically when the battery hits 20%, 10%, or 5%. Same on the M7 with slightly different numbers.

Interesting you guys post this today, because just this morning I got an ota from att adding it in

Posted via my sixth Sense HTC M8

Extreme power saver mode if your battery is that lower just turn off mobile data, gps, Bluetooth, wifi, etc. I know this feature goes deeper but good hell people.

Using the Power Saving mode on & off. When I don't need to be on network or Internet I use it. Power savings are super! After 7hr on the X-mode , I had 96%battery left. Not bad at all!
Luv my M8...:-$

By the way, the clock app is also available. Just tap on the time like the normal widget. Weather is absent and replaced I leaf icon to signify the mode.

Posted via Android Central App

There are mods on some custom ROMs that let you replace one of the apps on the list, I have replaced the calculator with the music app to stay in this mode while listening to tunes. Still mostly effective with this mod

Posted via Android Central App

I've used it on my One Max. It was nothing special and it didn't save my battery. I was even on WiFi.

NexusLogic - Working on his Nexus 7 in the Nexus Lab

I've used EPSM on my M8 a few times and it definitely helped me get a few hours out of it at 10%. Of course it's not meant for you to use it constantly, there are still variables that'll drain your battery (signal, the screen, etc.) I have found myself forgetting to turn off the regular power saver until a few days later because I unchecked "disable vibration." Performance seemed the same to be honest.

Posted via Android Central App

Just so you guys know, you CAN enable and use lock screen widgets to add functionality. Add a bookmark widget or Google now to go to internet browsing. I love using EPS Mode, when not using my phone. At work, sleeping, playing a game, watching a movie. All reasons I freeze my phone's battery, to a nearly sudden stop in power drain.

Posted via Android Central App

Just so you guys know, you CAN enable and use lock screen widgets to add functionality. Add a bookmark widget or Google now to go to internet browsing. I love using EPS Mode, when not using my phone. At work, sleeping, playing a game, watching a movie. All reasons I freeze my phone's battery, to a nearly sudden stop in power drain.

Posted via Android Central App

For a weekend camping trip (with limited power access) I decided to try out EPS,, I also turned off mobile data, Bluetooth, WiFi and GPS to make sure.. I turned everything back on when I got home and the battery was at 58%..... That was 2 days and 3 hours later...... Well impressed.

BTW.. I had 3 phone calls, took a 1 min video, took a few photos, sent a few emails and a very little browsing... I obviously turned on what I needed to do to allow this

I activated EXT SAVER yesterday at 5% and didn't do anything. I just made 2 calls lasting for 3 minutes....my battery died in 6 hours. How can they say that 5% will take you to 15 hours. At times I have activated at 19% and the battery will run down to 14% in 2 hours without doing much calling or texting.