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Setting Profiles by Probeez is useful for extending battery life among other things.
As far as preserving battery life, you can set this app to turn off your WiFi antenna at certain locations and times. The settings can be very granular.
Examples
Turn off WiFi if I am at work (based on GPS/ Cell Tower/ and or Wifi available) on Fridays between 12 and 1 (When I am in a meeting.) and turn it back on after 1 (if I am at work)
Turn on WiFi when I am at home or when plugged into an AC charger but not the car charger.

You can also start apps based on a myriad of conditions.
Some Android users might find this useful.
My original droid's battery lasted longer with it.
However, my HTC Flyer doesn't seem to need it. The battery on the Flyer lasts about a day and a half.
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Battery life
swmace 12th Sep 2011
My HTC Evo 3D doesn't have any issues with battery life. My original HTC Evo didn't seem to have them either. To be fair, I generally keep Wi-Fi turned off unless I need it (which I rarely do thanks to Sprint's real unlimited data plan). My corporate email syncs from our server whenever an email comes in, I browse the web, read books through the Kindle app, text message, make phone calls etc and, like the previous poster, my battery tends to last a day to a day and a half. Maybe HTC just manages power better?
I couldn't read this article in it's entirety as that blasted overlay going on about the Data Centre obscured your text.
If you are going to advertise over the top of your article text and you want readers to read it, then common sense says give us a proper "Cose" button, not an "Expand" button.
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Contributr
Let us know what platform you're on (mobile or desktop OS and which one) and which browser you are using. I do not see this issue with my Android tablet or my desktop OS (Mac OS X or Windows 7) using Dolphin, Firefox, Chrome, IE 8 & 9, Safari or the Android Browser. It is very hard to code for every possibility out there - but if you share more details with us, I'll make sure we follow up with our web design team to try and address your issue.
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Task Killer
RipVan 13th Sep 2011
I went to the web at one point because my battery was a year and a half old and every phone I have had didn't seem to hold a charge as well after that length of time. I found some articles saying that the task killer type of software was obsolete because the newer OS's would all monitor the battery usage and adjust it on the fly. Most of the posts I read said that manually changing things would make the monitoring system go out of whack.

Not sure if it helped or if it just got better on its own. I'm looking to the future for my next phone, it is, after all, a throw away culture, and I am ready for my "two and new..."
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Contributr
Task Killers
dcolbert@... 13th Sep 2011
Task Killers have always been controversial. When I purchased my ASUS TF101 the battery life was good enough - it had a 16 hour run-time - but STANDBY was horrible. Left alone in a bag it would be on empty the next morning. A big part of this was firmware and hardware problems with the early TF101 tablet and docks - and an RMA has improved the situation considerably. During the time between discovering the issue and ASUS releasing a fix, I played around with a lot of solutions to resolve the issue, including Task Killers. My experience in this case was that there were certain tasks running in the background that were making the issue worse - and managing those tasks manually did indeed result in improved battery life. Now that the underlying hardware issues are resolved, I don't need to manage the apps as well. I think that illustrates that it is usually more than one issue. The apps are probably coded "right" for a device that sleeps properly. When the device did not sleep right, the apps had no way of knowing that they should be conserving power - the power buffet never closed and they kept going back for seconds as long as that was the case. ASUS has been very good about admitting issues and addressing them. Other vendors and manufacturers are not always that responsive, if they address issues at all. In a case like that, manual process management may be your only choice until you can find another device. For users who experience that - my suggestion would be to pick a different manufacturer the next time around. There are a lot of good companies out there - there is no reason to waste your time with a product that the manufacturer does not want to support or update. Unfortunately, in the Android world, those unresponsive manufacturers and their products reflect poorly on the entire Android experience. This is made worse by the fact that even the best manufacturers seem to struggle with getting it right out of the starting gate. Rather than have ASUS quickly respond to the fact that they released a product with serious flaws, it would have been great if they had simply gotten it right before they released their product to the public.
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Contributr
All of the feedback seems to indicate that people with HTC Android phones seem to enjoy remarkable battery life.
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Battery life was my biggest concern when switching from Bbry to Android. I had it rooted and use and CPU clocking app to change the clock speed during sleep mode to save even more power...but that didn't really provide a noticeable difference.

I did, however, notice a nice jump when I found the motorola-official 2.3.3 build for the 2 and installed it. Then I got rid of motoblur (yuck) and have LauncherPro instead. Battery life for me is WAY better w/out the motoblur on top of the stock Android.
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Contributr
I'm not sure I even understand what Motoblur is, in that case. But I guess I'm mostly surrounded by Droids and Droid 2s... and the occasional HTC Evo on Sprint. Doesn't seem like Motoblur is a radical departure from stock Android?
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