JuiceDefender

JuiceDefender

JuiceDefender saves battery power (lots of it!) by controlling the mobile data connection, WiFi, Background data, Auto Sync and other battery-hungry components.

You can schedule regular activation to let background synchronization occur, have connectivity always enabled while the screen is on, and much more! It also helps in minimizing distractions ;)



The Easy Mode is a no-fuss one-click way to let your battery last longer - much longer. Just enable JuiceDefender by tapping on the big button and you're ready to go!

If you want more fine-grained control, try Advanced Mode, where you can configure the many JuiceDefender features to your liking.

Should you Download JuiceDefender? Yes! Must Have Android App! [Android Tapp]

JuiceDefender is an app that you won't believe you lived without.  You will be impressed by the amount of battery that you actually save, and might even consider buying the paid version! [Best Android Apps Review]

I went from 16 hours of use to 48 with a Nexus One. [...] I wholeheartedly recommend this killer, beta app. [DroidDog]

Can’t get much better than that. [designerati daily]

For a free Android application, JuiceDefender offers quite a number of impressive battery-saving features. [Daily News 1001]

For Android users i highly recommend JuiceDefender: Use the Juice when you need it, save it when you don't! [lo-ga-rie]

Besides the battery savings, those who like to parse out their email checks and avoid minute-by-minute distractions see some benefit here, too. [lifehacker]

JuiceDefender can automatically control on your behalf mobile Data/APN/Sync, 2G/3G toggling, WiFi, Screen off/Screen lock Timeouts, maximum CPU frequency (all but Data/APN/Sync require UltimateJuice).
Note that not all of these are available on all handsets - please refer to the Compatibility Matrix section in the FAQ.

There are a number of triggers for the enable/disable behaviour:

Schedule - keep the connectivity enabled or disabled all the time, or enable it briefly on a regular interval (every 5 minutes to 2 hours), to let background data sync occur (email, Twitter, Facebook, stock quotes...). If Quick is enabled the connectivity stays enabled for a shorter period; this potentially saves the most battery, but you should also enable the Traffic trigger to make sure all data is synced.

Night (requires UltimateJuice) - keep the connectivity disabled during night time; you can also optionally put the phone in Silent Mode or Airplane Mode.

Battery - disable the connectivity when battery gets below a specified percentage

Charger - keep the connectivity enabled while the handset is being charged.

Traffic - don't disable the connectivity until data transfers are completed - useful to make sure that syncs aren't interrupted, or for streaming radio apps etc.

Peak (requires UltimateJuice) - keep the connectivity enabled during work hours, if you need to be instantly reachable via email/IM/VoIP etc.
Apps - you can choose which apps will keep the connectivity enabled (Pandora, last.fm...) and which will disable it (games, offline reading...)

Screen - keep the connectivity enabled while the screen is on (or just when it's unlocked) to allow browsing, tweeting, procrastination and general internet-powered enjoyment, regardless of scheduled events and battery level.
Location (requires UltimateJuice) - disable WiFi when the handset is not in range of any known WiFi network. The location is determined via the cellular network, so it's usually quite coarse. It's a fully automatic set-it-and-forget-it WiFi manager!


Triggers are listed in ascending priority order - this means, for example, that when the screen is on the connectivity will be enabled even when the battery is low, or that the regular schedule won't occur during the night period.

Note that triggers will only enable WiFi/Background data/Auto Sync if you have explicitly turned them on - if you turn any one off manually, your decision will be remembered and no trigger will turn it on again (until you re-enable it).

Having data enabled 2 minutes every 15 minutes is sufficient in most situations. A longer schedule interval is useful to minimize distractions when you need to get something done ;)

You can have everything under control by enabling the Notification - the current status of all controls and triggers will be always available in the notification pane.

There's a Home screen widget that shows an estimate of how much battery life was improved by JuiceDefender over the last 48 hours - what's the best multiplier you can get?
It also lets you enable/disable JuiceDefender super-quickly (just tap on the glass of juice in the bottom left).

Another included useful widget is Toggle mobile data - it lets you manually disable or enable mobile data (you might want to use it when you're incurring roaming charges, for example) with a single tap - it has the highest priority, so JuiceDefender will always obey it.

Please note that not all features are enabled in the free JuiceDefender. The free version on the Market can only control only mobile data/APN/Auto Sync, and the available triggers are Screen, Apps (1 disable and 1 enable), Battery, Charger, Traffic and Schedule with frequencies of 15 and 30 minutes.

To get complete control over your handset juice consumption please consider buying UltimateJuice from the Android Market or AndAppStore - it will enable WiFi, Timeout and CPU control, unlimited Apps, the Night, Peak and Location triggers and Schedule intervals of 5 minutes, 1 hour and 2 hours. You can make your battery last forever! (ok, that's an hyperbole.)

If you want to check how much your battery life is improved by JuiceDefender, get JuicePlotter now - the best looking and most informative battery graph out there! Free on the Android Market!

If you want to know more, please read the Known issues / FAQs and the changelog!

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