Sansa Fuze - battery life

[karolp1993]

Hi! I know fuze port isn't supported, but i've only one question. On rockbox, battery life is only 5 hours. On default soft is 25 hours. Why on rockbox is it so short?
karolp1993
Edit:
On default soft is 10 hours. My fault

[saratoga]

Thats a matter of debate.  Probably due to various things not being clocked as efficiently as they could be.

Also, if you get 5 hours in Rockbox, you'll probably get 7-8 in the original firmware and have a nearly dead battery.

[karolp1993]

On another Fuze, is the same problem.

[nabule]

Hi! I know fuze port isn't supported, but i've only one question. On rockbox, battery life is only 5 hours. On default soft is 25 hours. Why on rockbox is it so short?
karolp1993
Edit:
On default soft is 10 hours. My fault

In Sandisk website, he said
"Up to 24 hours for audio playback and 5 hours of video playback with internal rechargeable battery**"
http://www.sandisk.com/products/sansa-music-and-video-players/sandisk-sansa-fuze.aspx
but in rockbox only 5 hours?!
I think different format's music will affect the battery life, which format did you use?


very sorry for my poor english

[Avalon]

Hi, I have a Fuze and have been using the RockBox music functions for several months now.  Thanks to the RockBox team for a great product....far better than the stock OS.

Is anyone working on moving the Fuze port to supported status and adding the remaining functions?

I believe that optimization is one of the items which would help the battery life.

[emkeyen]

Hello. I have the same problem. I can see the battery meter tick away when I'm using Rockbox on my Fuze that I got new only this autumn, thus highly doubt that the battery is old. I'm mostly playing VBR MP3 and OGG. My guess is that there is either some process running wild or a that Sansa sf uses some hardware decoding not used by RB. Are there any developers interested in this? I'm just asking.. Would do myself but hardware C is way out of my league, I'm a Java/AS3 dev myself...

Cheers all devs for great work
Em.

[AlexP]

The Fuze has no hardware decoder chip.  It is of course possible that Rockbox does not shut down some hardware the the OF does.  However, until you actually measure the run times in both firmwares it is all just guessing.  Turn off an signal processing (such as equaliser) and measure the runtime in both. 

[emkeyen]

Ok. Back after a very unscientific test. I flashed my Fuze with the latests Sansa FW, making it boot to OF by default and used it as "normal", meaning my daily use while commuting. Now I have a restored power cycle of over a week between mandatory charging. With RB I was down to a few days (- with or without signal processing). I am now convinced that RB draws much more power than OF and that its not my device that has worn out battery cells or whatever.

If there is something constructive I can do to help with testing and finding out where the power draw might be, please let me know. I really like RB and appreciate all the devs efforts.

Em.

[funman]

It was suggested the FM chip isn't powered off properly in rockbox.

You could measure runtime by leaving the radio on in both OF and rockbox and see in how much time it turns off.

If it's comparable we will have found the cause.