Rockbox General > Rockbox General Discussion
Battery Utilization observations/questions --- (not again!!!!)
scorche:
Also, it is better if you use enough song in the playlist to fill up the buffer, rather than just one song.
TexasRockbox:
I'm utilizing the entire "Pet Sounds" album, not just the song. The album was compressed with .OGG Q7. The battery benchmark indicated to use an album, so I did so.
OK, whatever the WPS battery readings indicate are meaningless. The Battery Benchmark plugin shows that the player played for 12h 1m 19s -- can it be assumed that that number is correct? If so, is 12h 1m 19s playing exclusively .OGG files with a headphone load and the bass and treble controls slightly elevated (not using either the software or hardware EQ) a bad, good, or outstanding figure? From reading various posts 12+ hours with Rockbox with ipod 5G Video 80GB would seem to be a very good figure.
Not trying to cloud the discussion but to further understanding: If the WPS figures are meaningless how to explain the sudden jump from a consistent 4h 49m to a consistent 14h 0m -- it must mean something to some piece of software or firmware even if we don't understand what it is -- it doesn't appear to be a random number.
I think to some extent all consumer battery remaining indicators are only (at best) generally accurate. So 14hours indicated lasted 12hours in actuality -- I don't think that's too bad -- 85% accurate. I'm certainly not going to sweat the minutes. I think the number indicated in the WPS is adaptive and represents a formulated figure based upon usage (current draw) over some period of time. Therefore, I would expect the actual, raw numbers to go up and down a bit (giving the appearance of meaningless, inaccurate, etc). Rockbox has the ability to display the raw numbers while the ipod uses a segmented display. The accuracy of the reported numbers may be good enough for a 4 or 5 segmented display (accurate to 25% or 20%).
Has this type of battery WPS behavior (sudden 7h swing upward) been reported before?
I wish I had copied the first battery test results off the ipod HD (I did rename it though). So I won't have anything further to report until either very late tonight or tomorrow morning.
soap:
12 hours is good in a battery bench.
For the last time - ignore the WPS time estimates.
I'm assuming you first saw the 14h estimate on or after the 14th of July?
Right after http://www.rockbox.org/tracker/task/7216 got committed?
Have you seen the 100%=4h estimate since?
Regardless, it doesn't matter. Actual runtime, not estimated runtime, is the test. (Unless you want to hook your opened iPod to a bench power supply and measure amperage)
TexasRockbox:
Yes it was noted after the 14th of July -- on the 19th when I opened the topic.
My Rockbox might be a July, 16th build or a July, 19th build. Not shure about the 7216 fix but since it appears to be available beginning with the July 14 build, I woud think that it is installed.
Have not seen the 100% = 4h 49m on the WPS since the 19th but did see it on the 18th, 17th, 16th.... back to since I had obtained the player.
The second Battery plugin test is still running. I'll verify it all when it completes sometime late tonight.
TexasRockbox:
Second test completed (returning ipod settings to default):
Rockbox version r13922-070716, Bass +5, Treble +5, Sony Ex90LP 16ohm, Beach Boys "Pet Sounds" album repeated, encoded Q7 ogg Vorbis.
The second test ran for 11h 59m 55s by the benchmark figures. Looking at the "%" figures thorughout the test, those percentages would seem to be generally accurate enough for a 4 segment battery indicator -- not perfect by any means but close enough to give a rough estimation of remaining time -- my view, anyway.
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