This first part of the JuiceDefender manual will give you an overview of how it works, the preset profiles, and other commonly used features.

How JuiceDefender works

Today’s smartphones are just great devices, but they seem to be plagued with short battery life. Two main reasons for that:

  1. they have highly power-hungry components and functions
  2. many of these are constantly running - even when unnecessary - wasting precious battery life

JuiceDefender’s goal is to fix the latter point, making your Android device an energy-efficient one - so that it can run at full capacity when you need it, but save battery when you don’t!

Long lasting juice

In short, JuiceDefender optimizes battery consumption by automatically managing the most power-draining components of your phone, so that they are used only when needed, rather than left running all the time for no particular purpose - like when the phone is idle and not being used.

On top of that, for those who like to tweak, JuiceDefender gives full control over a plethora of specific energy saving settings.

  1. JuiceDefender is not a task killer - task killers are generally a bad idea.
  2. JuiceDefender doesn’t defy the laws of physics: it can only optimize power consumption. The improvement in battery life will be significant in almost all cases, but it greatly depends on how much the device is used, among other factors - don’t expect much if you browse the Internet 24 hours a day.

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How to work JuiceDefender

JuiceDefender works in complete automation. Its configuration can be as easy as one tap, via the preset profiles; or amazingly deep through customization.

  1. The preset profiles (Balanced, Aggressive and Extreme) are the quickest, no-fuss way to gain precious hours of extra battery life. Just select one from the Status tab under Profiles and JuiceDefender will take care of the rest!
  2. You can adapt any preset profile to your specific needs in two minutes with the Customize profile, which lets you personalize the most commonly used features.
  3. The Advanced profile allows you to really go under the hood of your handset and tweak all the power saving options in JuiceDefender. Each function and control has a detailed explanation.

JuiceDefender can be launched and controlled via two home screen widgets and the QuickBox, a handy pop-up box that allows quick interaction with the app. Read more below.

    JuiceDefender Enabled
  1. Remember to make sure Enabled is selected in the Status tab, otherwise JuiceDefender will just stay dormant on your device and won’t be able to save battery life for you.
  2. Switch Profile
  3. To activate any of the 5 profiles, tap on the chosen profile button (in the Status tab). A brief text description of that profile will appear; scroll down a bit to find a button labeled Confirm: tap on this button to activate the profile.
  4. Sometimes when you try to switch profile the confirm and cancel buttons do not appear; this is a bug in the Android UI framework that can occasionally manifest itself. In most cases quitting the JuiceDefender UI by pressing back (not home) then reopening it will fix the issue.

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Preset and custom profiles explained

What follows will give you a general idea of how JuiceDefender's preset and custom profiles work.

The Balanced profile

JuiceDefender balanced profile

When the screen is ON, connectivity is automatically switched on, unless you manually disabled it via device settings or power control widget, in which case JuiceDefender won’t touch it. (Check the Connectivity Controls section on the comparison table to learn what radios are automatically managed by JuiceDefender).

When the screen is OFF, JuiceDefender assumes that you don’t need connectivity to be *constantly* on, so it only enables it at 15 minutes intervals, allowing background synchronization to occur and notifications to get to your device (e.g. new email, facebook notifications, twitter notifications...). The synchronization interval can be easily changed via the Customize profile.

Connectivity is a huge power sucker, so leaving it off when not necessary will significantly extend battery life!

Can't live without instant notifications? Check out the tutorials in the How-Tos section.

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The Aggressive profile

When the screen is ON, connectivity is automatically switched on - unless manually disabled. (Check the Connectivity Controls section on the comparison table to learn what radios are automatically managed by JuiceDefender).

When the screen is OFF, JuiceDefender only enables connectivity every 30 minutes to allow emails and other notifications to get to your devices. (The synchronization interval can be changed via the Customize profile).

JuiceDefender aggressive profile - battery threshold

When the battery gets low (the “low battery threshold” is configurable from the Status tab), connectivity remains disabled even when the screen is on, and the background synchronization is halted entirely to make those last drops of juice last as long as possible - allowing you to make or receive that last important phone call. If connectivity is needed, you can quickly enable it temporarily via the QuickBox (notification/widget) - or, naturally, manually override JuiceDefender via power control widget, device settings, or JuiceDefender’s Toggle mobile data widget (remember that manual override is not temporary).

If you have JuiceDefender Plus or Ultimate installed, JuiceDefender will additionally manage connectivity through the Night schedule (connectivity disabled while you sleep) and will make sure to only enable WiFi when you are close to a known network using the Location trigger. These additional features are easily customizable via the Customize profile.

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The Extreme profile

If you use the Internet sparingly or if phone calls are critical for you, this profile allows you to achieve really long battery life.

Connectivity is turned off by default; you can quickly enable it when needed via the QuickBox (notification/widget) - or manually override JuiceDefender via power control widget, device settings or JuiceDefeneder’s Toggle mobile data widget.

JuiceDefender extreme profile - configure apps

Additionally, connectivity can be automatically enabled for those apps that need it, like your preferred browser or email app. Tap on Configure apps to select what apps you want to allow Internet access for; or just enable the Interactive mode: JuiceDefender will then prompt you to allow or deny connectivity when a not-yet-configured app is launched - you’ll find that your most used apps will be configured in a few days at most. For a throughout explanation read more about the Apps trigger.

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JuiceDefender customize profile - Settings tab

Even though the preset profiles work well for most people, JuiceDefender offers great customization options. The Customize profile allows you to adjust any of the preset profiles described above to your specific needs, to get the most out of your battery.

Starting from the preset profile you want to customize, tap on Customize and then Confirm. A new tab called Settings will appear featuring several configurable power saving options. Here you will be able to allow or disallow JuiceDefender to automatically manage for you mobile data and WiFi; change the frequency of the background synchronization Schedule; set a Night schedule to make JuiceDefender disable connectivity when you are sleeping and you don’t care to be bothered by emails or notifications; configure the Location-aware WiFi control, and finally automatically enable or disable connectivity when you launch specific Apps.

A text description is available underneath every setting, guiding you through the customization. Especially if you have JuiceDefender Plus or Ultimate, you’ll definitely want to take advantage of these customizable settings!

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Advanced: complete customization

JuiceDefender advanced profile - new tabs

If you want total control over the energy consumption of your phone, the Advanced profile is what you need. It really unleashes JuiceDefender’s full potential, allowing you to access and fine tune every power saving feature to your specific needs.

JuiceDefender advanced profile - settings summary

After the Advanced profile is selected and confirmed 3 new tabs will appear - Controls, Schedules and Triggers - containing all the settings offered by JuiceDefender. A summary section at the top of the Status tab will show you at glance the current configuration, providing quick links to the relevant sections by tapping on the buttons to the left.

Every setting is explained by a text description. For more in-depth information on any specific setting consult the settings reference section.

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Other features

In this section you'll learn about some additional features and tools JuiceDefender offers to keep your battery consumptions under control.


JuiceDefender notification options

The notification allows you to check JuiceDefender's status at a glance and access the QuickBox easily.

The Notification section is in the Status tab. You can choose between a simple text notification or a graphical, more informative one.

If QuickBox is enabled, tapping on JuiceDefender’s entry in the notifications pulldown will launch the QuickBox.

JuiceDefender notification entry

Even though the notification can be completely disabled, using either the text or graphical one is recommended, as it minimizes the chances of JuiceDefender being killed by the Android OS. The persistent icon in the status bar is useful to quickly diagnose JuiceDefender’s functioning (especially if the Apps trigger is active); if you don’t care for it you can simply hide it by enabling Hide status bar icon.

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JuiceDefender widgets

JuiceDefender comes with two useful home screen widgets that help you keep things always under control.

The JuiceDefender widget comes in two variants, 1x1 and 2x1, and shows the current status of controls and triggers as well as an estimate of how much battery life was improved over the last 48 hours. Tapping on this widget will launch the QuickBox.

The Toggle mobile data widget lets you quickly force-enable or force-disable mobile data with a single tap, if you need to override JuiceDefender’s control. This has the highest priority and will be enforced also if JuiceDefender is completely disabled - so handle with care!

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The QuickBox

JuiceDefender QuickBox

The QuickBox is a handy pop-up dialog, featuring a limited number of useful commands, that allows quick interaction with JuiceDefender. It can be reached easily, by tapping on JuiceDefender’s entry in the notifications pulldown or on a JuiceDefender widget in your home screen.

If the connectivity is currently enabled you can temporarily disable it - for example as you are about to start a long Kindle reading session. The temporary override will cease once the screen is turned off. Conversely, if connectivity is currently disabled (e.g. because you’re using the Extreme profile) you can enable it - again, temporarily until screen off.

If the Peak and/or the Night schedules are enabled, you can manually activate/deactivate them. If Brightness is enabled, you can temporarily disable it until the next screen off.

Finally, you can open JuiceDefender’s main UI, or disable it altogether.

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Plus and Ultimate

Get JuiceDefender Plus or Ultimate!

With JuiceDefender Plus and Ultimate, additional power saving features are at work on your device. For a complete list of what is available on each of the 3 versions check the comparison table.

JuiceDefender free/Plus/Ultimate - features comparison table

It’s worth reading the settings reference section to learn everything about the additional features that can be enabled or customized, such as Location-aware WiFi controls, Night and Peak Hours Schedule, Smart Brightness and many more.

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