MicroSD and Battery Life effect...

[esgikey]

Originally Posted by saratoga

Ok so you've got the "new" SD controller, while mine has the "old" one. I should do a battery bench on mine, maybe the "new" variant behaves differently the the "old".

can you tell me, how many variant of SD controller clip+ has ?

it is because my Clip+ AMSv2 so it has the new controller, and rockbox 3.7.1 not optimized for this new controller...

i'm sorry if i ask too much.... hehhehe

[CrowdAds]

[soulzero]

interesting keep this going

[FluffyWings]

Awesome news.

Sandisk Class 2, 16GB Card 16:14:17
2GB Card 8:00:31

Clearly MicroSD's can cause the drain. So glad I can hit my >15 hours now. Yay!

[Marvin the Martian]

Originally Posted by FluffyWings

Awesome news.

Sandisk Class 2, 16GB Card 16:14:17
2GB Card 8:00:31

Clearly MicroSD's can cause the drain. So glad I can hit my >15 hours now. Yay!

That's cool. I don't know why anyone would buy a 2 GB card anyways, given how cheap the 16GB ones are now.....but now you've given people another reason to avoid the 2GB cards.

[esgikey]

Originally Posted by FluffyWings

Awesome news.

Sandisk Class 2, 16GB Card 16:14:17
2GB Card 8:00:31

Clearly MicroSD's can cause the drain. So glad I can hit my >15 hours now. Yay!

so, we can say that microSD consume more power than microSDHC ??

[FluffyWings]

I am not sure. Chances are its a generational reason. Newer controller and lower nanometer memory probably reduce the power consumption. I would bet that most SDHC cards are a safe bet.

[esgikey]

yes, it's reasonable that newer card has lower power consumption, since technological refinement give us more efficiency.

but, i still hope there is any improvement in rockbox, even in standard capacity card...

rockbox is truly ROCK SOLID......

[Alexddr]

Sandisk specification says

Automatic Sleep Mode
A unique feature of cards in the SanDisk SD Card Product Family is automatic entrance and
exit from sleep mode. Upon completion of an operation, cards enter sleep mode to conserve
power if no further commands are received in less than 5 milliseconds (ms). The host does not
have to take any action for this to occur. However, in order to achieve the lowest sleep current,
the host needs to shut down its clock to the card. In most systems, cards are in sleep mode
except when accessed by the host, thus conserving power.
When the host is ready to access a card in sleep mode, any command issued to it will cause it
to exit sleep, and respond.

all the cards brands will have the same battery life??

someone could post his results with kingston or a-data or any other brand to compare them

i don't want to make the mistake buying a wrong card (16 or 32 GB)


PD: sorry for the bad english

[FluffyWings]

Very interesting information about the SanDisk cards.

[esgikey]

Originally Posted by Alexddr

Sandisk specification says




all the cards brands will have the same battery life??

someone could post his results with kingston or a-data or any other brand to compare them

i don't want to make the mistake buying a wrong card (16 or 32 GB)


PD: sorry for the bad english

so, whatever the device, as long as SANDISK CARD, powersave mode are available....

but i think coordination between host device and card itself is needed.

[FluffyWings]

A google search of microsd battery life shows that 2GB cards cause many problems. I would imagine that any microsdhc card will be fine.

[priell3]

I found with some informal testing that my Clip+ battery lasts 9.5 hours with or without a microSD card (4GB Transcend Class 6).

What I did was fully charge it and set it to shuffle play through an assortment of .ogg, .wma and .mp3 files ranging from 128k to 320k.

Negligible gain in battery life playing entirely 128k files from external memory only.

I set brightness to minimum, backlight to 5 seconds, volume about 1/3. Stock firmware.

[esgikey]

tonight, i borrow my sister's card ;1GB.

it shows

IRmax : 35..45 mA
RWmax : 35..45 mA

compared with my card

IRmax : 60..80 mA
RWmax : 60..80 mA

i hope it will give me better battery life.... i will post it soon.....

[bertrik]

The max. current indication in the disk info debug screen in rockbox is a bit misleading. It only provides meaningful current information for relatively older cards. It will be wrong for SDHC cards, for example.

[esgikey]

in this case, my sister's card is manufatured in 2009, and it was a microSD not SDHC.

and last test gave me 15h : 5m runtime.

so i can conclude that different brand have different power consumption.

as said in wikipedia

Power consumption

The power consumption of microSD cards varies by manufacturer, but appears to be in the range of 66-330mW (20-100 mA at a supply voltage of 3.3 V). Specifications from TwinMos technologies list a maximum of 149mW (45 mA) during transfer.[21] Toshiba, on the other hand, lists 264-330mW (80-100 mA).[22]

[saratoga]

I tested current SVN with my Clip+ using an 8GB Kingston SDHC card with V2 lame mp3s, and got:

16:30 w/o card
16:15 w/ card

So at least on my player with my card there is no real hit from having SD.

[Mikerman]

Thanks for the post--always nice to see current time estimates.

[downtime]

Battery test:
"New" used 8GB Clip+ bought from Amazon
32GB Sandisk MicroSD
Rockbox
Mostly FLAC but some 256K VBR MP3
No equalizer
16 hours and 38 minutes continuous run time.

[Mikerman]

Wow!