Last Updated: Jun 17,2010
Im fairly certain that wifi will draw battery by just being on but wasn't sure about bluetooth.
I would like to know this as well
I have left it on and left it off for full days and haven't noticed much difference. I'm sure it's still running since it has to look for a paired BT device to connect to when in range.
Bluetooth and GPS is a radio which draws power. Whether it is in active use or not, if the radio (bluetooth or GPS) is on, it will draw power.
GPS only draws power when its actively searching, period.
Bluetooth takes about an hour off my days battery life, but I'm in and out of the car so much I don't mind.
I leave GPS/BlueTooth/WiFi on 100% of the time. The three have no noticeable impact in battery life. I think WiFi actually HELPS (conserve 3G signal usage), and BT and GPS are just periodic heartbeats. Now with BT connected/paired, I don't know. It's likely a little more, but not much.
I've noticed Bluetooth really sucks battery power when there is nothing connected to it. It's worse than other devices I've owned. I used to leave BT on all the time before but I can't on the Evo. It has a noticeable drain.
But when you can get 40 hours easily with BT on, why disable it??
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