I am doing my own battery test.

[uxaar]

According to anandtech.com the video playback test come in at 10.5 hours with the wifi on which to my understanding it means that a video stored locally is being played on a continuous loop for 10.5 hours.

These figures seems to be very optimistic so i decided to do my own test.

The conditions of the test:
Wifi on
100 percent battery
brightness 100%
video stored locally .
screen on.
Google location services disabled
Gps and sync disabled.

The video plays on a continous loop.
So far is been playing for about 2 hours 45 min. and the battery is at 61%.

The way it goes it will not reach 10.5 hours in a thousand years as it was claimed by those at anandtech.

This is what they say on their website" Battery life while playing back locally stored video is just as impressive. Here the Nexus 7 clocked in at over 10.5 hours on a single charge, 82% longer than the Kindle Fire."
Read more at AnandTech - The Google Nexus 7 Review

Am i missing something ?
Have i misanderstood what 10.5 hours of video playback means?
Are these tests done differently under different conditions?

Thank you.

 

[natehoy]

The screen is most of the battery usage. I doubt they run their comparison tests at 100% brightness. They probably also turn wifi off.

 

[mysterygirl]

The screen is most of the battery usage. I doubt they run their comparison tests at 100% brightness. They probably also turn wifi off.

Agree, I doubt screen is at 100%. For MY use, I never use my screen at 100%, so also a little impractical (at least for me).

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[cusinndzl]

When I review gadgets for my blog and when I do battery tests I almost always keep the brightness at auto and do the tests indoors which means the brightness is lower than 50% most of the time.

 

[tntdroid]

I keep mine at 40% and everything looks great to me. Try the test at 50% with WiFi off since its not needed.

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[uxaar]

thanks guys...

but what i am trying to do here is replicate the results of the test done by anandtech.

it looks like i am missing some details .
they probably done their test at 50% brightness.

But when it comes to wifi ,as you can see from their test they kept it on.

curently i am at 43% battery .
The video its been running now for 3 hours and40 minutes

 

[rootbrain]

thanks guys...

but what i am trying to do here is replicate the results of the test done by anandtech.

it looks like i am missing some details .
they probably done their test at 50% brightness.

But when it comes to wifi ,as you can see from their test they kept it on.

curently i am at 43% battery .
The video its been running now for 3 hours and40 minutes

The screen is the killer here, definitely. You can see by your results that you will get something better than half the time they did, but they almost certainly did not use 100% screen brightness. Run the same test at auto and see what you get.

 

[uxaar]

sorry...the idea that the test is done with the wifi on came from engadget and not from anandtech.com where they say "And of course a tablet is only good for as long as you can use the thing, and we were quite impressed by the longevity here. We came within spitting distance of 10 hours on a charge using out standard rundown test, which has the tablet connected on WiFi and looping a video endlessly. That's very, very good for a budget 7-incher and bests many bigger, more expensive slates."

obviously none of these sites tell you what was the brightness set at .

 

[uxaar]

the result.

6 hours of continuous play..

 

[GiantJay]

I also have my NFC turned off, I figure it doesn't help the battery.

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[uxaar]

I also have my NFC turned off, I figure it doesn't help the battery.

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i had it turned off during test

 

[uxaar]

this is what carphonewarehouse.com claims:
"9.5 hours battery life tested playing 720p video, brightness at 100nits, external microphone, Wi-Fi turned on and logged in to Gmail."

this is completely false and misleading.
am i missing something ?

 

[pete_lockwood]

You set your brightness to 100 nits? How did you test that?

100 nits is not 100%.

 

[uxaar]

You set your brightness to 100 nits? How did you test that?

100 nits is not 100%.

they probably mean 100 units

 

[natehoy]

the result.

6 hours of continuous play..

What brightness level did you end up using for your test?

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[uxaar]

What brightness level did you end up using for your test?

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As i said in my first post the test was done on full brightness 100%.

I think this issue needs to be looked at more carefully given the various claims floating around the net.

You cannot achieve 9.5 hours of continuous playback on 100% brightness ,wifi on...etc.

 

[jonsnowden]

100 nits on nexus 7 is 25%

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[pete_lockwood]

they probably mean 100 units

No. They don't. A nit is a measure of brightness and has nothing whatsoever to do with the percentage value displayed when you adjust your screen.

 

[NickA]

As i said in my first post the test was done on full brightness 100%.

I think this issue needs to be looked at more carefully given the various claims floating around the net.

You cannot achieve 9.5 hours of continuous playback on 100% brightness ,wifi on...etc.

Did anyone claim 9.5 hours with 100% brightness? And there are other environmental factors as well. Ambient temperature would be a good example. That affects battery life. So unless it's in a lab/controlled environment, one can only give estimates.

I'd be interested to see what you get running auto brightness, or 50%.

Maybe submit this to MythBusters and they can run some tests

 

[natehoy]

As i said in my first post the test was done on full brightness 100%.

I think this issue needs to be looked at more carefully given the various claims floating around the net.

You cannot achieve 9.5 hours of continuous playback on 100% brightness ,wifi on...etc.

What issue? You've read a review not from Google or Asus and you can't reproduce the result based on your own test when you don't know the parameters of the original test anyway. The test never specified they did it at full brightness. I just went back and read it. You added the 100% requirement to your test.

Rerun your test at a lower brightness or ask the reviewer what brightness they used.

If playing movies for ten hours at 100% brightness is a requirement for you then you'll need to return it and find a tablet that meets your needs. I'm not sure one exists. That's a big battery on a seven inch tablet though maybe a better screen could do it. Not gonna happen on a budget build like the nexus 7.

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