i don't want big brother pin pointing me at all times... hehe
I leave bluetooth on all the time because I don't want to forget to put it on when I get into my car. In NY state using your cell phone while driving without a hands free device is illegal. It really uses fairly minimal power.
Screen time is the major drain on my phone. I have the media doc and recharge my phone at night every night since it is now my alarm clock and sleep radio and the phone has never been below about 40 to 50% power. Maybe I am just a light user.
Maybe I don't know what I'm doing but I've never found a way to turn GPS on or off. What I mean is when I use the car I press navigation and I see the GPS icon come on but once I navigate away from it the GPS icon disappears. I also don't see any battery use at all for GPS.
What am I missing people? Still got lots to learn it's only been two weeks.
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On my phone leaving having blue-tooth on is the difference between 2 -3 days before needing to charge or needing to charge after 6 - 8 hours.
I also use Screebl to keep the screen on when using and have the screen timeout set to 15 seconds when I screebl notices that it is not in use.
Last edited by timlitw; 12-14-2009 at 08:37 AM.
wifi WILL drain your batt. It will constantly look for a wifi connection if it is left on (even if you don't see the wifi symble at the top). With wifi on my droid only lasts about 8 hrs. with it off it will last for 2 days. I leave my GPS on and BT off at all times. I have wifi on off app and turn it off when I don't want to use wifi.
I leave my wifi on 24/7 and my battery does fine. That's because I'm usually in a wifi location, home or work. I have found that Bluetooth and GPS drains it faster. So I use the Power widget to turn BT and GPS off most of the time. The power widget is just a good thing to have on the home screen. You can do your own testing that way.
OG Droid retired but serving as a wireless tablet now and then.
Try this. Leave Bluetooth on all day. Check the Battery Usage feature in Settings/About Phone.
I leave mine on all day. I use bluetooth headphones for over an hour each day.
Mediaserver typically uses more battery power playing the music I'm listening to than sending it to my headphones over bluetooth. Six percent for the tunes, 4% for BT. I can afford 4% for the convenience of having BT on when I want it.
As you'd expect, and find in your own results, lighting the display takes the most juice. Since the 2.0.1 update, I've noticed a big drop in display power used based on the faster screen shut off when left locked. In the two weeks prior, I'd find my phone unlocked in my pocket because the keyboard shifted open slightly. One time, my home pages were rearranged and I was sending garbled text messages. I explained to my confused recipients that my Droid was disgruntled with being in my pocket. Brain the size of a planet, and all I do all day is bounce off his thigh...
If you haven't stumbled into the Battery Usage feature, it's fairly amazing to be able to see feature-level AND app-level battery stats. Makes it pretty easy to spot a pig, and I'm sure developers are aware it exists.
Wifi is going to actively scan for open hotspots and consume battery, but ONLY if your device is unlocked. Unlike an overcaffeinated co-worker, the wifi is not going to bother notifying your pocket lint that you're near a hotspot. It only activates a scan based on turning wifi on, unlocking the screen, and it probably checks for coarse location changes, jumping towers, as you drive/walk around but I have no way to know that, I'm only speculating. I've also never walked out of range of my wifi then back into range with my Droid locked and in my pocket to determine if it reconnects to wifi while locked or just quickly reconnects when I unlock it. Sorta have more interesting things to do...
GPS, I never actually shut off so that it can be available when I open a GPS-using app. It actually is off most of the time. GPS is only really in use when the satellite icon with the green radio beams is visible. The rest of the time, it's sitting idle waiting for an app to ask for fine location. It consumes zero battery while idle.
IMHO, a lot of care went into allowing these features to be enabled, but if you use your Droid a lot you'll likely find you can't afford the battery power for their added up effect of being on all day. That'll increase based on how often you have the screen unlocked and you're using your Droid. It's designed to assume that if you're interacting with it and you have BT and wifi on, you're interested in knowing about BT and wifi devices near you. That's going to use battery power.