Over and over, blogs everywhere are reporting the great battery saver of turning off your Bluetooth radio on your Android phone. Unfortunately, the truth isn’t always apparent in blogs and this is one occasion where you shouldn’t believe everything you read.
When you see the battery information on your EVO, you might think you need to take drastic measures to save every ounce of power you can. But, when you begin to disable things like your Bluetooth radio, you begin to eliminate functionality of the device. The Bluetooth radio is most commonly used for hands-free calling, but with the newer accessories available on the market today, Bluetooth can be used for tethering, music streaming, device sync and more.
As one begins to dissect the battery life on the EVO, there are a few major power crunchers that are easy to eliminate. It looks very concerning to see numbers like the ones in the screen capture below. When you see a process consuming 25% of your battery after 1 hour of use, it’s simple to see why so many people insist that streaming music through Bluetooth ‘destroys’ the battery.
What is seen above is a simple 1 hour screen capture after streaming Bluetooth music via the on-board music player for the entire 56 minutes the EVO has been off the charger. A simple baseline test showed the EVO battery drained 10% during the 1 hour test. 85% was used for a starting point in the test to make sure there was no deviation from the trickle charging or other variances from charge times or voltages.
The EVO was running the same apps with no email polls or other outside programs running besides the Music Player. The display was checked at 15 minute intervals for 30 seconds. Based on those numbers, with the battery charge percentage dropping from 85 to 75, it can be concluded that the active streaming of Bluetooth audio contributed to a discharge of about 2.5% per hour.
In theory, a user can playback Bluetooth music for 10 hours a day – assuming your earphones will handle that much before dying – and only consume about 25% of the battery. This is about the same as watching 30 minutes of SprintTV, or 60 minutes of SD Card video. The music player itself contributes to a 1% drop during the hour or about 10% of the battery when used for 10 hours of playback.
So, before panic mode sets in, look at other reasons for battery drain before deciding that Bluetooth audio is a bad idea. First and foremost, check for background apps that sync like FriendStream, Peep, Weather, Stocks and News. A simple Facebook refresh can cost as much as 2% on the battery and a 30 minute update interval will blow 40% of the battery in the same 10 hour period.
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