Database Users

[TIPS] How to make your G2's Battery last longer

Its time we need a thread like this to ensure every G2 user is getting the best out of their battery.
Here are my tips:
- WiFi: Should ONLY be ON when you are actually using it!
- WiFi Sleep Policy=NEVER: it takes more time and power to seach for a Wi-Fi AP than actually staying connected to it. Settings > Wireless & networks > Wi-Fi Settings > MENU > Advanced > Wi-Fi sleep policy > Never.
- Bluetooth: Should ONLY be ON when you are actually using it!
- Use 2G when possible: If you know you are in a area with NO 3G support, than set your phone in 2G mode so it doesn't use power looking for 3G. Settings > Wireless & networks > Mobile Networks > 2G only
- Haptic feedback=OFF: I personally leave this OFF because minor vibrations are annoying plus consume battery. Settings > Sound > Haptic feedback
- Audible Selection=OFF: For obvious reasons, we use the touchscreen the entire time, enabling this will case battery drain everything you make a selection in Android, App, Web. Settings > Sound > Audible Selection
- Display - BRIGHTNESS=30%: I use about 30% brightness when indoors - when I am outside I turn it up brighter using Power Control widget. Settings > Display > Brightness.
Note: You can also leave it on AUTO, which is will provide optimal bnrightness with respect to ambient light.
- Display - Animations=Your choice: I personally have ALL of them enabled, but that is scarificing a small amount of battery power. If you do NOT need the pretty transitions, you can opt for other options. Settings > Display > Animation.
- Display - Screen Timeout=30: I leave mine at 30 seconds, as I think that's ideal for most situations. Settings > Display > Screen timeout.
- Location - Wireless networks=OFF : The phone uses tower and signal strength to calculate your APPROXIMATE location, which is a waste when you have GPS. NOTE: This feature assists in fiding your location indoors. If you plan on using GPS outside on than you should leave it OFF. Settings > Location & Security
- Location - GPS=ON: It should be ON if you plan on using MAPS or Navigation. NOTE: GPS is ONLY used when system needs it! Having it Checked OFF does NOT help battery life. The only time GPS is active is when you see the icon in the notification bar. Settings > Location & Security
MAJOR CONSIDERATIONS
- DATA - (3G/HSPA+) - Hogs the most battery, even more than the brightness of the phone. The reason for that is when you are surfing, searching, texting basically anythin that requires 3G/HSPA+ data the radio, CPU, and RAM are always working to ENCODE and DECODE data going in and out the device. This process requires all 3 major components to work simultaneously which draws more power from the the battery!
- Widgets - Widgets like facebook, twitter, weather, news do have processes running in the back which draw DATA depending on your refresh options. ie, You will draw less power if your facebook/twitter updates every 3 hours instead of 1.
- APPS - Always keep in mind that APPS like messengers and others which constantly need data DO run in the background. Background apps will draw DATA AS needed, which bring it back to the point above. Always make sure that you SIGN OUT of APPS that require background data, IF you don't plan on using them.
- Live Wallpaper - yes, it looks pretty as we all know it. Sadly, the truth is that both CPU and GPU are working hard in the background to bring a smile to your face when you look at the screen. Live wallpaper will affect your battery about 5 - 10%, dpepending on which one are you using.
- Vibration - Considered important as well.... if you are a CONSTANT texter/EMAIL-er AND you dont need Vibration, than you should turn it off. Vibration actually takes more battery power than actualy sounds.
- Volume - Should be considered important because the higher the volume the more battery power it'll take. If you can do just fine with a Mid-level volume than you should set ringer to mid level!
YOU SHOULD NOT USE A TASK KILLER APP
http://geekfor.me/faq/you-shouldnt-be-using-a-task-killer-with-android/
^^^ That explains everything about it ^^^
I'd be happy if one of the MODs made it a sticky, so we dont get Qs or reposts
and ofcourse I will also include any tips you guys have.... please leave a comment and explain why&how you think it saves battery life. I will than add it in this list

thanks for this.
auto-brightness works for me. also, wireless network location is kind of necessary because gps won't locate you when indoors. when you're indoors you don't really need an exact location anyway because you probably know where you are. but using wireless networks to get your approximate location enables you to quickly search for things nearby.
one more thing I might add - my G2 seems to constantly switch between edge and hspa. I think I recall this being an issue for the N1 too. if I'm not mistaken, switching taxes the battery. so I set the phone to only use 3G (or only 2G depending if I want to use less battery). you have to have Anycut. then crete a shortcut to "phone info." here you can control the radio behavior. WCDMA is 3G, while GSM is 2G.
also, question: anybody ever have any luck conditioning their battery? I keep hearing that it improves battery life but it's never really helped me

Thanks for the tips! Though, what are you sources saying that WiFi sleep uses more battery? Auto-brightness does work for me, it is just very slow to make changes and tends to be on the brighter side.

most of these tips are pretty much universal for most of the current and past android phones.
LET IT BE KNOWN the main reason for battery drain (slow or fast) is APPS. They drain more than talking on the phone. They also are the main reason your screen (the next big battery killer) would stay on. In other words, don't complain about battery usage if you're using your phone constantly throughout the day @ work or home. ITS NOT GONNA BE GREAT!

joebobjoe said:
Thanks for the tips! Though, what are you sources saying that WiFi sleep uses more battery? Auto-brightness does work for me, it is just very slow to make changes and tends to be on the brighter side.
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Click to collapse
As an Electrical engineer, I work with wi-fi chipsets... The process is that when wifi is "sleeping" it temporarily goes to OFF when you lock the phone. [exception: when not using apps like pandora]. So when you turn the phone back ON, WiFi turns back ON and searches for the AP you were connected to. >> this process of turning OFF, ON, and SEARCHING, requires a more battery power than staying connected. When you are connected the router and phone are exchanging information (packets) on AS needed basis like when we use 3G/2G.
i did try Auto Brightness, its a bit Bright for me, i'm gonna continue to use it for the next few days, see how I like it.

joebobjoe said:
Thanks for the tips! Though, what are you sources saying that WiFi sleep uses more battery? Auto-brightness does work for me, it is just very slow to make changes and tends to be on the brighter side.
Click to expand...
Click to collapse
Auto-brightness seems to be buggy on the software side. The light sensor is very quick to detect changes, but the brightness doesn't drop back once it goes up. I feel that the brightness gets set to full at too low of a light level too. Using a screen protector and case does help a little by blocking some of the light, but it's not enough.

Actually, having GPS on consumes battery even when it is not used. And quite a lot. I have seen mayor battery boost after I started to turn it off when I do not use it. (on G1).

I've done some monitoring with PowerTutor and noticed that the Facebook app significantly drains the G2's battery (even when all features are disabled). If you sign out of it you should notice a 2+ hour increase in your battery life. People in my other thread have confirmed this and I think it might be a bug with facebook 1.3.2. I recommend making a link on your home page to m.facebook.com instead of using the facebook app.
I have also noticed that the e-mail app (NOT G-MAIL), when using Exchange ActiveSync, drains a good bit of battery when used with a Hotmail account (I'm not sure if other exchange servers have this problem or if the problem is in the e-mail app itself). The remedy that I have come up with for this is to make a new G-mail account, set hotmail to forward to it, and then on the gmail website go to Settings-> Accounts and Import and under the Send Mail As: section, add your hotmail account to it and set it as the default.
This way you get g-mail's lightweight mail pushing (which is just as fast as exchange) and it's transparent to you and everyone who has your hotmail address.
Besides those two tips, I recommend using PowerTutor to diagnose any abnormally low battery life issues you may have. My power usage is way down after fixing these two problems. Once in PowerTutor, go to View Application Power Usage, set Time Span to total, disable LCD monitoring, and set Sort By to Energy usage. Reset the power profiler and lock your phone and let it sit idle for about 30 mins to 1 hr, and then look at the application power usage. PowerTutor will probably be the top one, but you should also see what other applications are sapping your battery life.
Note: PowerTutor itself drains battery, so you should not constantly run it. I think it is set to start automatically so you will want to go in to settings and turn that off.

funkadesi said:
Its time we need a thread like this to ensure every G2 user is getting the best out of their battery.
Click to expand...
Click to collapse
+1 Sticky Please.

pmstc said:
I've done some monitoring with PowerTutor and noticed that the Facebook app significantly drains the G2's battery (even when all features are disabled). If you sign out of it you should notice a 2+ hour increase in your battery life. People in my other thread have confirmed this and I think it might be a bug with facebook 1.3.2. I recommend making a link on your home page to m.facebook.com instead of using the facebook app.
I have also noticed that the e-mail app (NOT G-MAIL), when using Exchange ActiveSync, drains a good bit of battery when used with a Hotmail account (I'm not sure if other exchange servers have this problem or if the problem is in the e-mail app itself). The remedy that I have come up with for this is to make a new G-mail account, set hotmail to forward to it, and then on the gmail website go to Settings-> Accounts and Import and under the Send Mail As: section, add your hotmail account to it and set it as the default.
This way you get g-mail's lightweight mail pushing (which is just as fast as exchange) and it's transparent to you and everyone who has your hotmail address.
Besides those two tips, I recommend using PowerTutor to diagnose any abnormally low battery life issues you may have. My power usage is way down after fixing these two problems. Once in PowerTutor, go to View Application Power Usage, set Time Span to total, disable LCD monitoring, and set Sort By to Energy usage. Reset the power profiler and lock your phone and let it sit idle for about 30 mins to 1 hr, and then look at the application power usage. PowerTutor will probably be the top one, but you should also see what other applications are sapping your battery life.
Note: PowerTutor itself drains battery, so you should not constantly run it. I think it is set to start automatically so you will want to go in to settings and turn that off.
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Click to collapse
i think with exchange rather than having the user select the refresh interval (ie 30 mins, 1 hour) the system is a ALWAYS ON connection which constantly checks your e-mail. As oppose to G-Mail..... they as get PUSHED to your phone by google's servers every time you get an e-mail as oppose to an ALWAYS ON system.
There is a lot of hush going on about the facebook app draining the battery... hence I addressed the widget/app parts..... as of now I think we should wait for an update to see how things change, it is a software bug.

Location - Wireless networks=OFF
By turning this off won't you in turn be turning off assisted GPS?
IE - the GPS will not have an approximate location and begin locating from there but will rather have to cycle much further to dial in and take much longer to calculate your position?
Just asking - if you haven't noticed a difference then that's cool.

I also noticed shop savvy was taking up alot of my battery drain. Looks like it was running in the background non stop. I uninstalled it.

Isn't WCDMA the HSPA+ network and CDMA the 3G? I currently have mine set to edge only since the speeds are slow all across the board in my town. Even on the phones down at the tmobile store. Hoping its just a minor tower issue in my area.
Sent from my T-Mobile G2 using XDA App

funkadesi said:
i think with exchange rather than having the user select the refresh interval (ie 30 mins, 1 hour) the system is a ALWAYS ON connection which constantly checks your e-mail. As oppose to G-Mail..... they as get PUSHED to your phone by google's servers every time you get an e-mail as oppose to an ALWAYS ON system.
There is a lot of hush going on about the facebook app draining the battery... hence I addressed the widget/app parts..... as of now I think we should wait for an update to see how things change, it is a software bug.
Click to expand...
Click to collapse
Exchange activesync should push email. I had set it to push and hotmail supposively supports this. Even if it doesn't, I tried setting it to polling and it still seemed to use a decent amount of battery life. Anyways something is wrong with activesync pushing.
Sent from my T-Mobile G2 using XDA App

funkadesi said:
i think with exchange rather than having the user select the refresh interval (ie 30 mins, 1 hour) the system is a ALWAYS ON connection which constantly checks your e-mail. As oppose to G-Mail..... they as get PUSHED to your phone by google's servers every time you get an e-mail as oppose to an ALWAYS ON system.
There is a lot of hush going on about the facebook app draining the battery... hence I addressed the widget/app parts..... as of now I think we should wait for an update to see how things change, it is a software bug.
Click to expand...
Click to collapse
Exchange uses Activesync, which pushes messages as well. The ongoing sync is for contacts and calendar items which if you do not make a lot of changes, change to off and sync then yourself manually.

markdurant said:
Exchange uses Activesync, which pushes messages as well. The ongoing sync is for contacts and calendar items which if you do not make a lot of changes, change to off and sync then yourself manually.
Click to expand...
Click to collapse
I had turned all Syncing off besides mail and it was still eating battery on push mode... just something to keep in mind for Activesync users who are experiencing abnormally low battery life

raqua said:
Actually, having GPS on consumes battery even when it is not used. And quite a lot. I have seen mayor battery boost after I started to turn it off when I do not use it. (on G1).
Click to expand...
Click to collapse
GPS ONLY uses battery when it is in use. You will know this because the icon will appear when it is being used. It doesn't use battery just being on. WiFi and Bluetooth do because they have to constantly "keep their eyes open" for things like networks and bluetooth devices that want to pair/communicate.
ddgarcia05 said:
I also noticed shop savvy was taking up alot of my battery drain. Looks like it was running in the background non stop. I uninstalled it.
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Click to collapse
I noticed this too on other Android phones but not on my G2. It would just show up in Battery Use even though I wasn't using it. If you want to see what is keeping your phone awake you can use the hidden Battery History menu. The "partial wake usage" is usually a big contributor for bad standby times. You could also try changing from WCDMA Preferred to GSM Auto PRL. This helps some people.

khaosxiii said:
Location - Wireless networks=OFF
By turning this off won't you in turn be turning off assisted GPS?
IE - the GPS will not have an approximate location and begin locating from there but will rather have to cycle much further to dial in and take much longer to calculate your position?
Just asking - if you haven't noticed a difference then that's cool.
Click to expand...
Click to collapse
A lot of people have been reporting that this feature as of NOW updates every hour, regardless of which services/apps need it. If you ask me, I haven't noticed any significant amount in the time it takes to get GPS location having that feature turned OFF. If you do a cold start (i.e. restart your phone) than the GPS will take a couple of more seconds to initialize for the first time use. However, from than on everytime you use the GPS it shouldn't take more than 10 seconds to acquire your position.

hah2110 said:
I noticed this too on other Android phones but not on my G2. It would just show up in Battery Use even though I wasn't using it. If you want to see what is keeping your phone awake you can use the hidden Battery History menu. The "partial wake usage" is usually a big contributor for bad standby times. You could also try changing from WCDMA Preferred to GSM Auto PRL. This helps some people.
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Click to collapse
Could you explain more about this settings, and how would one get to this setting.... If it helps save the battery I'll add it to the list

funkadesi said:
Could you explain more about this settings, and how would one get to this setting.... If it helps save the battery I'll add it to the list
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Click to collapse
Sure... At the phone menu (must be the native dialer), dial *#*#4636#*#*. Then chose Battery History and you can use the drop downs to control what you view. If you go to "phone information", you can change the preferred network type. Here you can force 3g only, etc. WCDMA Preferred fights to get a 3G signal and keep it. GSM Auto PRL uses a downloaded list to choose whether to use 3G or 2G, thereby saving battery in certain cases.

Tasker to Auto-Enable Wifi at Boot for Non-Activated Xooms

I'm sure there's lots of people out there who, like me, have not activated the wireless on their Xoom and plan on using it WiFi-only. The best thing to do is keep it in Airplane mode, as this supposedly keeps the wireless radio shut off. This is great, except if you shut your power off, Wifi will be disabled when you turn the Xoom back on. Not a big deal, and it only takes a few seconds to turn it back on, but so far I haven't really used the Xoom out of my home (so I always want wifi on)
I was restoring data after updating my Droid ROM when I thought of trying Tasker out on my Xoom. The interface doesn't look great on the big screen, but it seems to work ok? (Haven't done anything else with it yet on the Xoom). Anyway, here's the simple profile:
Context: Event > System > Device Boot
Task: Net > Wifi > Set=On
I suppose as a next step, you could probably add a wait action, and then have it check if it is actually connected to a network and disable wifi if not.
Anyone else try out Tasker on the Xoom?

turn wifi off while sleeping or juice defender

*I have bluetooth,nfc,gps turned off all the time just to be clear*
Do you think there is a difference between using the juice defender app and turning in the setting that says keep wifi on while sleeping:never ??
As in do you think one is better than the other ? Does one save more battery life than the other? etc

Don't use juice defender. The more crap you have running (software wise) the worse the battery. period.

Except that the wifi setting to turn off never works, or sporadically works. Try it yourself, set it to turn off and then check its IP every so often with pings, it'll respond.
I don't use JD, but I currently use Green Power, but I'm just going to go back to doing it in Tasker as I don't need it to sync periodically. As said, one less app that way, since I'm already running Tasker.

khaytsus said:
Except that the wifi setting to turn off never works, or sporadically works. Try it yourself, set it to turn off and then check its IP every so often with pings, it'll respond.
I don't use JD, but I currently use Green Power, but I'm just going to go back to doing it in Tasker as I don't need it to sync periodically. As said, one less app that way, since I'm already running Tasker.
Click to expand...
Click to collapse
I tried using tasker and I couldn't figure it out

Check out the free app called llama. I have it set to turn on airplane mode when the screen is off for 5 minutes and disable it when the screen turns on.

proud_whovian said:
I tried using tasker and I couldn't figure it out
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Click to collapse
I'll type out what I have. It turns off wifi if it's on, turns it on if it was on when going off. ie: If you have wifi off intentionally, it won't turn it back on. I also have it NOT turn off wifi if it's plugged in, listed as optional below.
Note that the %WIFI variable you can either type it in (all caps) or use the button to list all variables, it'll be at the end, Wifi Status.
If you still can't get it, I can export them.. heh.
To turn wifi off:
Add profile, set it for State->Display->Display State is off, and optionally, long-press on the Display Off you just created and click Add and select State->Power->Power->Any
Add Task, name it Wifi Off or whatever
Stop - if %WIFI (matches) off
Variable Set - %wifiStatus to %WIFI
If - %wifiStatus (matches) on
...Wifi - Set Off
End If
To turn wifi back on:
Add profile, set it for State->Display->Display State is on
Add task, name it Wifi On or whatever
Stop - if %WIFI (matches) on
If - %wifiStatus (matches) on
...Flash - Turning Wifi on...
...Wifi - Set On
Else
...Flash - Leaving wifi off..
End If

Wifi wont stay on

My n7 turns off wifi when I leave my house and doesn't turn back on when I get to work. Every morning when I get to work, I have to manually turn it back on. Is there a way to prevent the wifi from turning off so it automatically connects to my work network when I arrive?
BTW, I do have the "keep wifi on during sleep" checked.
Thanks

Me too. Every time it sleeps or the screen turns off, I have to switch it of then on for it to connect.
I have that always connect setting checked too. I also installed a Wi-Fi locker that's supposd to help but doesn't. There is an option called 'connect when the screen turns on - but you have to pay/upgrade. I'm tempted to pay but I think there should be a local fix/workaround.
Sent from my Nexus 7 using Tapatalk 2

Do you use Tasker or a Smart Actions app that is supposed to turn it off when you leave your home? Any Battery Saver options set?

Groid said:
Do you use Tasker or a Smart Actions app that is supposed to turn it off when you leave your home? Any Battery Saver options set?
Click to expand...
Click to collapse
I have an app called Battery Mix which just provides information about the battery and charge times, but it does not do anything with processes or battery/power management (so it claims). The device has had this issue since I got it out of the box.

I think the OP and #2 are having different issues. In any event...
Open the advanced Wifi settings by pressing the menu button, then Settings, Wireless & networks, Wi-Fi settings, and tapping the menu button again. You'll have a choice to either Scan, or go Advanced -- go Advanced.
Tap the Wi-Fi sleep policy entry, and you'll get a pop up dialog with the choices you see in the picture above. Choose Never.

[FIX] Stock Lollipop 5.0.2 Wi-Fi Battery Drain Issue

If you are on Stock Motorola Lollipop 5.0.2, check your Battery History in System Settings - you may notice Wi-Fi is constantly active, even when you turn it off.
In my case, the following setting in Viber was the cause: Settings > General > Wi-Fi sleep policy > Change to 'Use device's settings'
Instructions:
Firstly, go to: Settings > Wi-Fi > Advanced Wi-Fi > Keep Wi-Fi on during sleep > Change to 'Never.'
The issue appears to be that certain apps are keeping Wi-Fi active in Lollipop. Not every app may offer this setting related to 'sleep policy', a workaround is to use the App Settings Xposed Module - which allows you to disable such a permission for individual apps.
The permission can be known as: Change_Network_State.
After making these changes you may need to turn off Wi-Fi and restart phone.​
Related: https://code.google.com/p/android/issues/detail?id=79368

Thanks . it solve my real problem.

i have question. If we have change Keep Wi-Fi on during sleep to 'Never.' Will programs like Whatsapp or Viber get the gcm notifications when phone is going to sleep?

Dizzyrul3z said:
i have question. If we have change Keep Wi-Fi on during sleep to 'Never.' Will programs like Whatsapp or Viber get the gcm notifications when phone is going to sleep?
Click to expand...
Click to collapse
This is true, when phone sleeps - there is no Wi-Fi data connection.
Rather than leaving Wi-Fi on however, some people might prefer the phone wakes up every 15 minutes / 30 minutes / 1 hour, and enables Wi-Fi for 1 minute - allowing any messages to arrive. Many apps can do this, one example is DS Battery Saver.
There is also an argument that if you use Wi-Fi a lot, it's better to leave Wi-Fi on during sleep, because excessively enabling and disabling it is costly in terms of battery-life.

I've been using stock Lollipop on XT1008(Moto G Forte, I read it was just a "commercial" variant of the XT1032).
As far as I can tell, my phone doesn't report high Wi-Fi usage, but I disabled an option that I think it´s more responsible than the one mentioned here, that's "Search Always Available", this one was turning on my wifi when I even shut it down, wasting more battery than keeping it on.
Currently, my phone has been on like 13 hours and has 13% left, with a WiFi usage around 85% of the time.

Thanks for making us aware of that option in Viber.
But even after disabling that option in Viber, in the battery graphic seems like wi-fi is always active. Is it because I will also need to set "Keep Wi-Fi on during sleep" to "never"? But if it's set to never, doesn't it mean that when phone screen is off, it automatically switches off wi-fi even if you kept it on from the toggle?

lollerblade said:
Thanks for making us aware of that option in Viber.
But even after disabling that option in Viber, in the battery graphic seems like wi-fi is always active. Is it because I will also need to set "Keep Wi-Fi on during sleep" to "never"? But if it's set to never, doesn't it mean that when phone screen is off, it automatically switches off wi-fi even if you kept it on from the toggle?
Click to expand...
Click to collapse
Yes, 'never' means Wi-Fi is off when phone is sleeping. There is also the advance Wi-Fi option 'Scanning always available - which' you might want to disable.
Double check you have changed the setting in Viber, and you may need to reboot phone. It's also possible another app is causing Wi-Fi to always be active, for some it's Whatsapp.

lost101 said:
Yes, 'never' means Wi-Fi is off when phone is sleeping. There is also the advance Wi-Fi option 'Scanning always available - which' you might want to disable.
Double check you have changed the setting in Viber, and you may need to reboot phone. It's also possible another app is causing Wi-Fi to always be active, for some it's Whatsapp.
Click to expand...
Click to collapse
Ok so that option works as I thought, so for correctly receiving notifications with screen off it should be set on "always". I double checked on Viber's option and it's set correctly, then rebooted, plus scanning always available is off, geolocation (which can keep wi-fi on) is off and apparently there are no things that can keep wi-fi on.
Whatsapp does not allow to set wi-fi behavior, and the strange thing is that I have the same apps I had on Kitkat, where I didn't have such problem of viewing in battery graphic.
I am having the doubt if this may be only a Lollipop graphic issue or if wi-fi actually stays on...

lollerblade said:
Whatsapp does not allow to set wi-fi behavior, and the strange thing is that I have the same apps I had on Kitkat, where I didn't have such problem of viewing in battery graphic.
Click to expand...
Click to collapse
That's why I mention the 'App Settings' module in OP. I believe Whatsapp can and does cause this issue - there is just no setting within the app itself. You can check what permissions apps have by using 'App Settings.'

lost101 said:
That's why I mention the 'App Settings' module in OP. I believe Whatsapp can and does cause this issue. You can check what permissions apps have by using 'App Settings.'
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Click to collapse
Mmm yes I saw that...but I'm guessing that without root there's nothing else to do, right?

lollerblade said:
Mmm yes I saw that...but I'm guessing that without root there's nothing else to do, right?
Click to expand...
Click to collapse
No. Root would be necessary for changing permissions. However this issue may have been resolved in Android 5.1 - removing the need for this fix.

Wifi should be lefy alone as default to "never sleep"
Wifi should never sleep, even if the phone's cpu sleeps. Wifi will receive messages from whatsapp or whatever and wake up the cpu.
But if you put wifi chip to sleep, the phone will connect using 2g or worse, 3g or HSPA, and drain even more battery.
Wifi comes by default to "never sleep" for this reason, it is more battery efficient than 2g/3g.
And if you dont have wifi at home, all you have to do is slide down the menu and turn of Wifi. No need to change internal configuration on behaviour who only make things worse.
On the other hand, Viber is known for years to be a battery abuser.
I have been using android for years, and wifi policy was always the same, and my phones have idle times of several days
i even published some screen shots of my moto defy and moto G with a full week Idle without charging.with whatsapp and Wifi polocy never sleep.. With viber i wouldnt even try to make it last 2 days.