[Motorola Droid RAZR] Deron Baker:
Methods

To obtain the data, I ran a series of (somewhat) controlled experiments. Running the tests multiple times, I then averaged the results. I also held certain settings, such as screen brightness, the same throughout the tests to minimize variables.

Basically, I ran each test by noting the start time and start battery capacity (as reported by the Battery Circle widget in exact, not rounded, percentages). I ran the experiments according to my settings and methods and then noted the end time and end battery capacity. I then calculated the time elapsed (delta time) in hours for each run as well as the starting battery percentage minus the ending battery percentage (delta percentage points). Then I divided delta percentage points by delta time to obtain the Percentage Points per Hour (PPPH) drained. An example will make it clear:

For my Netflix 4g test, I did the following:

- Set screen brightness to 50%, no screen timeout, headphones volume 50%. Plugged in headphones. Set the Network Mode in settings to CDMA/LTE. Confirmed I had the 4g symbol on the phone.

- Wrote down the start time and start battery percentage.

- Opened up the Netflix app and went into my instant que.

- Started playing a movie.

- I either watched the movie or let the phone sit near me so I could verify it was playing.

- Periodically I would listen to headphones to ensure audio was still going. Periodically I would tap the screen to show the notifications bar to ensure the phone was still using the 4g LTE network. Periodically I would laugh at the absurdity of the Jersey Shore episode I was streaming. (I was not able to calculate the number of brain cells lost watching that show. Perhaps a future experiment.)

- After a while, I would then stop the movie and hit the home button to exit the app. I would then write down the end time and end battery percentage.

- I would repeat this process several times at varying lengths and varying starting battery percentages.

- For example, in my first run I started at 1043 (military time) with starting battery percentage 96%. The end time was 1220 and end battery 41%. The delta time was 1.62 hours, the amount of time from 10:43 am till 12:20 pm. This is 1 hour and 37 minutes. I divide 37 minutes by 60 minutes to get the time in decimal form. So 1 hr 37 min becomes 1.62 hrs. Now I take the start battery 96% and subtract 41% to get delta percentage points of 55 percentage points. Now divide 55 by 1.62 to get 34 PPPH. In other words, if it took 1.62 hours to drain the battery from 96% down to 41% that is the same as 34 percentage points per hour drained.

If anyone is interested in seeing the raw data: [http link not allowed at this time because I am a new user]

Let me highlight my settings:

- Screen brightness 50% on all tests that had the screen on

- Screen off for phone calls and streaming music.

- Speakers or headphones volume around 50%.

- Music stream test was done with Google music cloud player.

- For the phone calls test, I used my GF’s land line to call my cell phone. I played continuous music (the new Megadeth album) through the land line cradle to create a constant source of sound. I checked on my cell phone periodically to ensure it was still connected.

- For passive battery drain, I used the Smart Action app to turn off cellular data, WiFi, and GPS when the screen was off. I wrote down battery percentage and time before I went to bed and then shut the screen off. I did not touch the phone at all until I got up the next morning. Then I turned on the screen and noted the time and battery percentage.