How can I make the battery last longer?

Jorma V. -

Battery lifetime depends on how the device is used. Making a lot of calls, games and playing streaming videos consumes a lot of power compared to the case where the device is in idle state display blanked. Your device heating up is a sign of heavy strain on the device, meaning high battery drain.

If you are experiencing issues with starting up your device, sudden shutdowns or very rapid shifts in battery capacity, please send us a repair request.

 

CONTENTS

1 What drains the battery?

2 Investigating applications and processes as the cause for battery drain
2.1 Controlling the Android runtime (Android (TM) support)
2.2 Apps from untrusted sources

3 Sudden shutdowns or notable variance in battery charge levels

 

1 What drains the battery?

Below are some general tips on how to maximize battery life. The tips listed below are meant to give you an understanding of what drains the battery, so that when needed you can try to lighten the load on the battery and lengthen the battery life.

  • Always use the latest available version of SailfishOS.
  • Keep the phone connected to a charger when you sleep (or do not actively use the phone.
  • Set the "Sleep after" time as short as is convenient to you (Settings > System > Display)
  • Set the display brightness as low as still convenient (Settings > System > Display)
  • Set the background synchronization of email happen as seldom as good for you (Settings > Apps > Email > Sync). You can specify a dedicated sync interval for your Email accounts in Settings > Accounts > select your Email account. This same setting applies to the calendar sync, too.
  • Check your data transfer speed settings. By default your device will search for the fastest network available (4G), but if speed is not critical to you or you usually use a WLAN network, then consider using 2G or 3G mobile network instead (Settings > System > Mobile network > Network mode). Your battery life should be best on the "Prefer 2G" setting.
  • Turn Bluetooth off unless you need it on a regular basis (Settings > System > Bluetooth).
  • Turn WLAN off unless you need it on a regular basis (Settings > System > WLAN).
  • If you have used Internet sharing (WLAN hotspot, tethering) it is not a bad idea to restart the phone. Internet sharing has sometimes left the phone to a high current drain state.
  • Disable the Android service unless you use your Android apps regularly. There is more information about this later in this article.
  • Select the cellular operator (carrier) with the best network. The better the network coverage, the less the phone needs to rely on remote base stations and to swap between network generations (4G, 3G, 2G). If the operator has a firewall for mobile data then the phone will receive less (unnecessary) incoming data traffic, allowing it to stay in suspended state longer.

It is also good to restart the phone every now and then, and especially if it feels warm. It may be that after you have closed an application the system has failed in turning off all the processes the application (especially an Android app) required.

Sometimes it can also work to give your device a "fresh start" by resetting your device back to factory settings. This gets rid of any broken or badly working pieces of software and gives the software a fresh start. Creating a backup is greatly recommended before this procedure.

2 Investigating applications and processes as the cause for battery drain

It is quite rare, that the battery itself is the main culprit of battery drain. This is why it is good to attempt to rule out that applications or stuck processes aren't causing a heavy load on the phone, thus creating a battery drain and possible heating up of the device.

Search for one or more of the following applications in the Jolla Store:

  • Crest
  • Lighthouse

These applications will list running applications and processes, and report how much CPU power and Memory they require.

They also often offer to list apps, depending on their Memory footprint and how much they take up CPU power.

With Crest, please remember to make processes visible.

Screen captures from Crest main view and Settings. Here settings set to show only applications, and sort them by their impact on CPU power.

Lighthouse main view on the left, and the "Processes" view on the right. Processes sorted by their CPU Usage.

If you are able to pin-point an application or process that is constantly running at high CPU power, you now have tools to investigate the issue further.

  • If its an application, consider uninstalling or updating the application.
  • If it relates to a phone process, see if you can investigate the app it could be related to, or whether a simple reboot would solve the situation.
  • A device reset is often the best way to determine whether the software is causing the increased drain of the battery. Resetting your device is likely to have positive implications on the battery life.


2.1 Controlling the Android runtime (Android (TM) support)

The purpose of stopping or restarting the Android runtime is to see whether it is a process related to an Android application that is causing the battery drain because it is stuck or simply power hungry.

If you have SailfishOS version Uitukka 1.1.0.39 (or later) then install Sailfish Utilities from Jolla Store. Then either restart the Android runtime (Alien Dalvik) or stop it completely unless you need your Android apps on regular basis.



Stopping Android service: ends all processes related to the Android runtime. Will be restarted if you launch an Android app, but applications will start up very slowly after doing so.

Restarting Android service: ends all processes related to the Android runtime, and after this starts them up again.

 

2.2 Apps from untrusted sources

It is possible to install apps to Jolla such that those apps have not passed the quality control of Jolla. Typically those apps have been developed for Jolla but they have not yet been accepted to Jolla Store because they have failed some quality control steps.

We do not recommend installing these applications because they may cause unexpected problems which may be hard to identify and fix. They may also increase current consumption.

A common distribution place for such apps is OpenRepos/Warehouse.


3 Sudden shutdowns or notable variance in battery charge levels

If you are experiencing issues with starting up your device, sudden shutdowns or very rapid shifts in battery capacity, please send us a repair request.

Have more questions? Submit a request

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