[Shield Tablet Q&A, Help & Troubleshooting] CM17X:
Hey there, guys.

I want to share with you my tweaks to get a better battery life while the tablet is on idle. [KitKat - Scroll down for lollipop update]

Processor state: Optimized.

Initial battery percent: 82%

Final battery percent: 45%

Battery percent loss: 37%

On Screen time: 1h 14m

Awake time: 1h 22m

Real awake time: 8 minutes.

Interval of time: 16h 55m

After many tests, I've notice that for every 10% of battery you get, at least, 30 minutes of Screen On. You can squeeze it even further to 40 minutes for every 10%

As you will see on the pictures, the WiFi was on for 10 hours, the rest was off because i went outside where WiFi was not available.

Now, the next screenshot will show you the "Partial wakelocks", they are the one that keeps your tablet awake. The lower, the better, but some of then are necessary while you work/play/surf on the tablet, so they will be there anywhere.

Trying to understand the Blake_wakelock.

I've spent some time trying to figure out how to stop this wakelock. The blake_wakelock is used by the "Shield Wireless Controller" nVidia system App to pair the controller; i don't know why it keeps alive after turn off the controller; so far the only not-brute-force method i have to stop it is by turning off the WiFi, also, in good conditions the blake_wakelock stop itself whilts screen is off. Once you turn it on again it comes back to life.

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Requirements:

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Rooted Tablet.

System Tuner: https://play.google.com/store/apps/details?id=ccc71.pmw

(Optional) Disable Service: https://play.google.com/store/apps/details?id=cn.wq.disableservice

A list of what you need and What you don't need: The tweaks i'll show you is nothing more than disable many components that i don't need in some apps, for example, auto starts or syncing. Since i don't need location service, because i don't need my tablet to be with me all the time snaping pictures to instagram them and say "Hey, i am here, rapist", i don't need any of those, so, i disable everything related which is "safe" to disable.[/.]

[/list]

I'll attach to this thread a backup of the service i have disable, you can "restore" it using Disable service to auto disable the service. It may work for you or may not, so that's why i'll list the service i have off.

In order to see how to disable a service using System Tuner and achieving a short explanation, here is a video i made months ago about it using another android device:

https://www.youtube.com/watch?v=_dEwsckIa9E&list=UU7Gr3HOHtIF0i0_ptfaT0JA

List of unnecessary services:

Google Play Services:

com.google.android.gms/com.google.android.gms.analytics.service.AnalyticsService
com.google.android.gms/com.google.android.gms.analytics.service.RefreshEnabledStateService
com.google.android.gms/com.google.android.gms.analytics.internal.PlayLogReportingService
com.google.android.gms/com.google.android.gms.analytics.service.PlayLogMonitorIntervalService
com.google.android.gms/com.google.android.gms.checkin.EventLogService
com.google.android.gms/com.google.android.gms.config.ConfigFetchService
com.google.android.gms/com.google.android.gms.subscribedfeeds.SyncService
com.google.android.gms/com.google.android.gms.playlog.service.PlayLogBrokerService
com.google.android.gms/com.google.android.gms.plus.service.ImageIntentService
com.google.android.gms/com.google.android.gms.plus.service.OfflineActionSyncAdapterService
com.google.android.gms/com.google.android.gms.auth.be.proximity.authorization.userpresence.UserPresenceService
com.google.android.gms/com.google.android.gms.common.analytics.CoreAnalyticsIntentService
com.google.android.gms/com.google.android.gms.wearable.node.bluetooth.BluetoothClientService
com.google.android.gms/com.google.android.gms.wearable.node.bluetooth.BluetoothServerService
com.google.android.gms/com.google.android.gms.wearable.node.emulator.NetworkConnectionService
com.google.android.gms/com.google.android.gms.wearable.service.WearableService
com.google.android.gms/com.google.android.gms.wearable.service.WearableControlService
com.google.android.gms/com.google.android.gms.fitness.service.DbCleanupService
com.google.android.gms/com.google.android.gms.fitness.service.BrokeredFitnessService
com.google.android.gms/com.google.android.gms.fitness.sensors.activity.ActivityRecognitionService
com.google.android.gms/com.google.android.gms.fitness.sync.FitnessSyncAdapterService
com.google.android.gms/com.google.android.gms.fitness.sensors.sample.CollectSensorService
com.google.android.gms/com.google.android.gms.fitness.wearables.WearableSyncService
com.google.android.gms/com.google.android.gms.fitness.service.DebugIntentService
com.google.android.gms/com.google.android.location.wearable.LocationWearableListenerService
com.google.android.gms/com.google.android.location.fused.NlpLocationReceiverService
com.google.android.gms/com.google.android.location.geocode.GeocodeService
com.google.android.gms/com.google.android.location.network.NetworkLocationService
com.google.android.gms/com.google.android.location.internal.GoogleLocationManagerService
com.google.android.gms/com.google.android.location.internal.server.GoogleLocationService
com.google.android.gms/com.google.android.location.reporting.service.ReportingAndroidService
com.google.android.gms/com.google.android.location.reporting.LocationReportingService
com.google.android.gms/com.google.android.location.reporting.service.LocationHistoryInjectorService
com.google.android.gms/com.google.android.location.reporting.service.DispatchingService
com.google.android.gms/com.google.android.location.places.PlaylogService

Normal User Applications:

I tend to look for service or activities/services/receivers such "Boot receiver", those trigger your app anytime your tablet boots up, keeping it awake. So, if you have an application that you enjoy and it auto start in background while you're not using it, you can disable those service and keep them calm.

I recommend SD Maid for detect autostart components and disable them easily using the "Toggle autostart components off/on". Indeed, if you keep using Facebook, you can control it by disabling a lot of trash services.

com.onelouder.baconreader/com.onelouder.baconreader.CakeDayService
com.onelouder.baconreader/com.onelouder.baconreader.billing.BillingService
com.onelouder.baconreader/com.google.analytics.tracking.android.CampaignTrackingService

Google Service Framework:

com.google.android.gsf/com.google.android.gsf.checkin.CheckinService
com.google.android.gsf/com.google.android.gsf.checkin.EventLogService
com.google.android.gsf/com.google.android.gsf.update.SystemUpdateService
com.google.android.gsf/com.google.android.gsf.gtalkservice.service.GTalkService
com.google.android.gsf/com.google.android.gsf.gtalkservice.service.GTalkServiceProxy
com.google.android.gsf/com.google.android.gsf.gtalkservice.service.ConnectionService
com.google.android.gsf/com.google.android.gsf.gtalkservice.service.ConnectionServiceProxy
com.google.android.gsf/com.google.android.gsf.gtalkservice.PushMessagingRegistrarProxy
com.google.android.gsf/com.google.android.gsf.gtalkservice.PushMessagingRegistrar

In addition, Freeze Gtalk and Google Plus; you'll still able to sign into Google play games by leaving the rest of the Plus services active (The ones that are not listed as disabled).

Done.

Lollipop Update:

After a week of testing, Lollipop seems to be battery friendly, for example, the Blake_wakelock is not a problem anymore, on this new update the service is triggered anytime is needed, and it's killed once you disconnect your Shield Wireless Controller.

Without any extra tweaks, all the services disabled above still working fine for Android 5, but some others are not safe to disable; for example, disabling the Youtube Auto-start services cause several Play Service crashes and it's almost unusable.

The next pictures will show you the battery life i got with those tweaks and plus my power setting profile: 2 cores and 50% Max Speed. (The same results with Optimized profile, it seems like the Power Saving mode is not working properly on this update)

On normal conditions (Web surfing, reading and watching videos on Youtube and similar) the battery lost percent is 5% for each 15 minutes.

As you can see next, after 42min on screen, i lost 10% of the battery.

The settings menu shows 20 hours left:

After 60% of the battery consumed, i got 2hours 53min on screen. The 36min of held awake were due downloading games in the background. By that time my Shield was on battery since 1day 3hours and 32min:

And with that said, the settings - Battery shows 19 hours left on Battery:

GSAM Battery monitor measurement:

You can find attached the list (*.txt file) of the services I've disabled, you can actually use this with Disable Service app, place the file into /storage/emulated/0/ and restore it, all the changes will be applied (Root is mandatory)

More results (January, 2015 update):

This is what i got recently. Bright to 30% or kinda more, Optimized power mode and gaming (Sky Gamblers: Storm Raiders using iPega at maxed graphics, which is a battery eater with 10% of battery for every 15 minutes of game play - Stickman epic and GRID games). I'm rooted. Running OTA 2.0 Android 5.0

Starting from 93% to 28%; after 1 day and 12 hours, i found it at 82% (0.3% per hour) and a estimated of 13 days left:

So, after start playing demanding games, it went down quickly, still got a good life time expected on battery:

You can clearly see when i was playing:

Final measure (I don't like it goes under 40% or 20%

Obviously this tablet needs an improvement for future versions of it, with more power to offer a real good experience, but in my opinion, taking care of your battery will give you a good space to play with it.

Some disabled are trying unsuccessfully to achieve that by try and fail. Anyway...

I would like to see yours.

More results - Updated 01/10/2015

And even more! - Updated 23/01/2015