Juice Defender to control your Android battery drain
Tuesday, March 2nd, 2010
Here’s an interesting application, which was pointed out to me today; it’s called Juice Defender (despite the screenshot saying Juice Control), which allows you to create a set of rules to limit certain battery draining functions; for instance, you can set it to only activate 3G & WiFi for a minute every few minutes, and whilst it does the activation, it will also check for updates and emails, but will then shut those connections back down to help save battery. There is a element of being location-aware, so you can set rules based on location too (although you’ll need Ultimate Juice for that, which is available from the Android Market).
There are 5 main triggers:
- Battery – when battery level gets low (less than 15%), disable APN/WiFi, and re-enable them when battery level is restored. APN/WiFi will also be enabled while the device is being recharged.
- Schedule – regularly enable APN/WiFi for a short period of time, to let background data sync occur (email, Twitter, Facebook, stock quotes…). If Quick is disabled APN/WiFi stays enabled for a longer period, useful if your data connection is very slow or you need to sync lots of data.
- Night schedule (requires UltimateJuice) – disable APN/WiFi during night time; you can also optionally put the phone in Silent Mode.
- Screen – enable APN/WiFi while the screen is on to allow browsing, tweeting, procrastination and general internet-powered enjoyment, regardless of scheduled events and battery level.
- Location (requires UltimateJuice) – this trigger controlled by the ‘AutoWiFi’ button. It disables WiFi when the device 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!
The priority order of the triggers is 1) location (WiFi only), 2) screen, 3) battery, 4) night schedule, 5) schedule – this means, for example, that when the screen is on APN/WiFi will be enabled even when the battery is low, or that the regular schedule won’t occur during the night period.
This looks a very interesting application, although whether Locale (which we covered here) offers more facilities (especially if you have regular access to a power source). If you are interested in Juice Defender, then see the authors website here.
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