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Old 26-09-2013, 7:16 AM
knighthorus knighthorus is offline
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Test results of S3 extended battery

We all know the Galaxy S4( mine is AT&T SGH-I337) is easily draining the battery very quickly if we use it heavily. OEM batteries typically only last long enough in phones to cater to the average user. So i knew before i even bought this phone back in June that i would be needing a bigger battery. After trying carrying spare batteries i was pleased to see that MPJ released a higher quality battery shortly after the Galaxy S4 hit the shelves.

Now this isn't my first Android phone or my first MPJ battery so i already had high expectations, but lets talk more about the Galaxy S4 battery.

I have been using the MPJ 7000 mah battery for over 3 weeks now. I had already noticed that it has more juice than the stock battery can put out even on an unrooted phone without being calibrated as some recommend. I work in a place where there is no cell signal unless i am on a break room. So i am forced to keep my phone in airplane mode if i want to make it through one or two day without the battery being drained.

My day usually goes like this. I fully charge to 100% right before i leave for work and as soon as i get into the building i go into airplane mode until i go on breaks. When i am on break its heavy internet usage and game playing pretty much any time i am not working. I had developed a pretty consistent statistic using the stock battery that by the time i had reached around hours of screen on at auto brightness my battery was just about to half die. When i switched to the MPJ battery i immediately noticed that i was able to get between much more hours of screen on time with auto brightness under the same conditions. I was already getting about a 200%+ increase in what i was using the phone for.

So i decided to do a comparison test with my oem GS4 2600 mah battery vs MPJ 7000 mah extended battery. I discovered there are battery benchmark programs on the android market but i was disappointed to see that they use all radio antennas during the test which will end up having skewed results since signal strength will vary from one test to another. I decided to come up with my own testing method and try to eliminate as many variables as i could to get a conclusive result.

I used the preloaded 3d movie on my phone to see how long each battery could do 3d video playback from a 100% charge until it died. For testing with each battery i put the phone in airplane mode and charged it from a low percentage until it just reached 100%. I used the app Full Battery Alarm to alert me as soon as the battery was full and it worked great. I used advanced task killer set to auto kill every 30 minutes in each test. I used full screen brightness in each test, with sound off in airplane mode to eliminate any gps, cell or signal variations during the test. I also tested at approximately the same ambient temperature (68F) with a fan blowing over the bare phone to keep heat out of the equation.

Since the movie is just shy of 2 hours i had to set a timer to reset the video just before it ended and start over from the begging to keep the test moving with each battery. My results were pretty consistent with what i had already seen from weeks of daily use. The stock GS4 2600 mah battery was able to run 6 hours and 10 minutesbefore shutting off while the MPJ 7000 mah battery went a much further 12 hours and 54 minutes before power itself off!

I am very happy with the extra power i get from this battery, now i do not have to charge my phone while i am at work, i can make it through an entire shift with my phone on me.

I would highly recommend this extended battery over the stock battery if you want to use it as your main power source. If your using it as an alternate battery its going to be a good bet too. MPJ offers this battery for $34.99 from their website.

If i do ever get my hands on one of those i will be doing a review of that also.

Comments and feedback are appreciated on my reviews guys.

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