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sansa battery life

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corvetteguy:
Sorry for thread digging but the OP had the same problem as me.

When plugged into the wall, the battery % reads 100%. After being plugged in for around 10 hours, i unplugged it and it read 84% and about 4 hours of runtime left. People here have said how inaccurate the read out is, but its funny because thats about how long it lasted. Without doing a battery bench, and just from timing it myself at school, the player lasted from about 9am to 11:30am, which is far from the 12 hours other people are getting. I also charged it using the OF to the same effect.

It can't be the battery because I only changed the firmware a few days ago after having this player since July 2006 and consistanly getting 17 hours of playback after charging for about 2 hours every morning.

I read somewhere about changing a text file to fix the meter but i know nothing about programming and am somewhat overwhelmed by massive notepad files 

I really hope I don't get another "Read the manual" response, or some sarcastic comment because i feel i have done my best to figure out the problem to no avail, and would really like to continue using RB.

Llorean:
It's nearly physically impossible that you've had the same battery life since July 2006, because lithium based batteries decay over time. Please, do a proper test both in the original firmware on a full charge, and in Rockbox on a full charge, with equivalent settings (volume at the same loudness, equalizer, bass, treble, replaygain, crossfeed, etc all turned off).

saratoga:

--- Quote from: corvetteguy on November 02, 2007, 09:55:57 AM ---
When plugged into the wall, the battery % reads 100%. After being plugged in for around 10 hours, i unplugged it and it read 84% and about 4 hours of runtime left. People here have said how inaccurate the read out is, but its funny because thats about how long it lasted. Without doing a battery bench, and just from timing it myself at school, the player lasted from about 9am to 11:30am,

--- End quote ---

I fixed runtime estimation the day before yesterday.  Upgrade your build and it'll give you a more realistic run time.  

Did you charge it in the OF?  I think rockbox doesn't actually charge the battery.  At least it sounds like your battery didn't actually recharge if its only reading 84% fresh off the charger.  That or its amazingly dead.

P.Opus:
If you read some of the forums regarding Rockbox and Battery issues on the Sansa, then you would notice two things.

1. Rockbox is not optimized for PortaPlayer based players.  This is due to the Rockbox team not having all the information regarding the chipset.  As a result, they are unable to know what optimiztions can be made (i.e. what can be turned on and off) to help optimize battery life.

2. Rockbox and battery charging does not work will well.  It has been documented somewhere that while running Dropbox, the USB cable only draws 100mA vs, 500mA in original Firmware.

This means that battery charging time under rockbox is 5 times longer and if you are actually running Rockbox during the charge, you might be barely breaking even if not actually trickle discharging.

So as it stands, the suggestions from the Rockbox team is to use Original Firmware for not only USB transfer, but also for battery charging.

There may be some future build which modifies the Rockbox USB charging routine, at which point we'll be able to use Rockbox while charging and actually be charging the battery.

corvetteguy:
Yes I read all that before. The thing is, even though they are not getting an accurate estimate people are still getting around 12 hours from a full charge, which i know is down from the 17-20 in the OF. I went from getting about 16 hours to 3 hours, so I just want to know how to get close to the 12 hours others are getting.

I have been charging under OF, overnight sometimes, so its not because of trickle charging.

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