MicroSD and Battery Life effect...

[esgikey]

is anyone know that when insert microSD card into my sansa Clip+, it will decrease the battery life ?

someone tell the difference in battery life while microSD card inserted.

with my experience i can't achieve 10 hours playback time with microSD card inserted. so i think that microSD consume more power than internal memory.

i've already test running battery life by remove microSD, and my Clip+ can achieve 14-15 Hours. with 50% volume and play mp3 format in various bitrate (128 - 192 kbps).




so, anybody can confirm this ?

[CrowdAds]

[saratoga]

I don't think theres any impact on battery life from using the microsd.

[esgikey]

Originally Posted by saratoga

I don't think theres any impact on battery life from using the microsd.

how about the roxkbox ? is it really improve battery life ?

[Mikerman]

Yes.

http://www.rockbox.org/wiki/SansaRuntime

[esgikey]

is rockbox 3.8 really stable for daily use ? give me an advice before updating..

thanks....

[Mikerman]

Yes. The Clip/Clip+ ports are "official" and stable.

A few notes:

-- With the Clip+, you still need to use the OF to transfer files.

-- As the Rockbox notes state, use of Rockbox could eliminate DRM file support from your player, even if you later get rid of Rockbox.

[esgikey]

i've do the battery test....

using rockbox :
- when memory card inserted, battery life about 9 hour, 32 minutes

- without microsd , battery life increase to be 14 hour , 29 minutes.

with condition :
- average volume -25dB
- flat equalizer
- random mp3 song (128 kbps - 192 kbps, also vbr)
- Headphone Sennheiser HD 202
- Rockbox 3.7.1


conclusion : so battery life is affected by microSD.....

[Marvin the Martian]

Originally Posted by esgikey

i've do the battery test....

using rockbox :
- when memory card inserted, battery life about 9 hour, 32 minutes

- without microsd , battery life increase to be 14 hour , 29 minutes.

with condition :
- average volume -25dB
- flat equalizer
- random mp3 song (128 kbps - 192 kbps, also vbr)
- Headphone Sennheiser HD 202
- Rockbox 3.7.1


conclusion : so battery life is affected by microSD.....

That doesn't seem right at all.....the times you are getting without a card inserted are typical of the times I get with a card inserted. 9 hours 32 minutes is more like the runtime of the Sansa firmware, not Rockbox.

[esgikey]

Originally Posted by Marvin the Martian

That doesn't seem right at all.....the times you are getting without a card inserted are typical of the times I get with a card inserted. 9 hours 32 minutes is more like the runtime of the Sansa firmware, not Rockbox.

hemm, i think there is a different power consumption of microSD each another.

different brand, different power consumption...

FYI, i'm using 1GB microSD, from my Nokia 2730 c bundling. so think, it's a bad card, with a low efficiency.

different with you, which is has a good brand card, with a low power consumption.

thats just my opinion based on my knowledge in computer science, my major at university...

CMIIW

[Marvin the Martian]

My card is a 16GB Class 2 Sandisk microsdhc.....so maybe the different card really is making a difference!

[skip252]

Your results are very different from mine. I have performed battery benchmark tests with the music all on the card, all on the player and split between the internal and external memory. All the results were within 15 mins. of each other.

I'm not sure what you are doing differently from me but there must be something.

Edit:
The brand and class of card hasn't made a difference for me. I've done the tests with everything from a Sandisk Class 6 16GB to a no-name 2 GB that tested as a Class 2. There was no appreciable difference in the results.

[selectortone]

I'm getting over 15hrs with my Rockboxed 8GB Clip+ with 16GB Sandisk Class 2 card - both completely full. All my files are 192kb/s VBR mp3s.

[esgikey]

Originally Posted by skip252

Your results are very different from mine. I have performed battery benchmark tests with the music all on the card, all on the player and split between the internal and external memory. All the results were within 15 mins. of each other.

I'm not sure what you are doing differently from me but there must be something.

Edit:
The brand and class of card hasn't made a difference for me. I've done the tests with everything from a Sandisk Class 6 16GB to a no-name 2 GB that tested as a Class 2. There was no appreciable difference in the results.

you mean , 15 hours ?

hemm, i can't explain this anomaly when using generic card, so i hope there is someone can do such a mini research and test about this anomaly.

my opinion still says, that different card, give different result. it's so make sense for me.

[Just Some Guy]

No, he means 15 minutes. All the tests resulted in battery life times that were within 15 minutes of each other. As in, there were only 15 minutes or less in difference from one test tot he next.

[skip252]

Not sure if my abbreviation was confusing so let me clarify. Card in or card out all the results came in within 15 minutes of each other if all the other conditions were the same. The card might be a no name cheapie or Sandisk's best. The average runtime was about 15 hours.

That would go down if I used the back light a lot or higher bitrate files. Using the files on the card or having a card inserted, cheap or not, didn't make a difference.

[Guut Boy]

Originally Posted by esgikey

is rockbox 3.8 really stable for daily use ? give me an advice before updating..

thanks....

I have been very happy with the update. It is plenty stable . As to the original question: I have not actually timed it but I havent noticed any less battery time while using a microSD card. I have a 8GB Clip+ with a 32GB microSD.

[esgikey]

hemmm... okay, thanks for all your opinions.....

i just want to know, what is the best codec for longer battery life ?
as far as i know, FLAC is the most efficient codec in rockbox.

but, i donno for lossy codec... any info about it ?

[Guut Boy]

There is an other thread on that here: http://www.anythingbutipod.com/forum...ad.php?t=61944

[FluffyWings]

Clip+ 4GB (128-192 mp3 VBR's)
- 6 hours with MicroSD, official firmware.
- 10 hours without MicroSD, official firmware.

300 mA battery over 15 hours is 20 mAh. MicroSD should impact battery life as it will use a few mAh.

I will retry with 16GB card with official firmware and then rockbox.

[esgikey]

Originally Posted by FluffyWings

Clip+ 4GB (128-192 mp3 VBR's)
- 6 hours with MicroSD, official firmware.
- 10 hours without MicroSD, official firmware.

300 mA battery over 15 hours is 20 mAh. MicroSD should impact battery life as it will use a few mAh.

I will retry with 16GB card with official firmware and then rockbox.

hahha, nice benchmark....
as i've said microSD also affect the power consumption, it's the same analogy when you connecting something into USB port in your laptop, it has some effect on battery life.

but of course microSD has a low power compared with USB port,