GTA02 Battery Capacity (Was: Re: More about the GTA02)

[Wolfgang Spraul]

Andy -

> class to expose it so it is generic.  (I don't know for sure if it  
> will
> ship with such a battery since it is decided in .tw according to
> availability and so on, but I hope it will.)

Yes, I think we can confirm that every GTA02 will ship with this new  
'smart' battery.
There are more steps to go through internally, related to  
certification, some sort of calibration. Tony, do you know more details?
The cell's capacity will increase slightly to 1250 mAh (before was  
1200 mAh).
I am trying to release the schematics for the small PCB inside the  
smart battery as well, will be posted to the wiki.

Wolfgang

On Feb 15, 2008, at 12:43 AM, Andy Green wrote:

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> Somebody in the thread at some point said:
>> On Thursday, Feb 14, 2008, "Kyle Bassett" writes:
>>> There is talk about pushing startup power control of the internal  
>>> devices
>>> (wifi, bt, gps, mmc, etc.) to user level, as every user may or may  
>>> not want
>>> certain devices available at bootup/all the time (availability vs.
>>> duration).
>>
>> Indeed, this along with good realtime stats on power usage and  
>> current
>> battery level would let people have reasonably accurate predictions  
>> of
>> their battery life.  It'd be interesting (to me at least) to turn
>> on and off the various peripherals and watch my projected battery  
>> life
>> go up and down accordingly.
>
> GTA02 is capable to dialogue with a "smart battery" that will allow  
> you
> to see the battery actual voltage and current flow (together: actual
> power) in uA down /sys in realtime, it uses the linux "Power Supply"
> class to expose it so it is generic.  (I don't know for sure if it  
> will
> ship with such a battery since it is decided in .tw according to
> availability and so on, but I hope it will.)
>
> The battery itself learns its cell performance over load and also  
> makes
> available its "time to full/empty" estimate down /sys as well in
> seconds.  You can see what data is available here:
>
> http://www.ti.com/lit/gpn/bq27000
>
> You can see stuff like this
>
> for i in capacity charge_full current_now present status technology  
> temp
> time_to_empty_now time_to_full_now type voltage_now ; do echo -n "$i
> " ; cat /sys/devices/platform/bq27000-battery.0/power_supply/bat/ 
> $i ; done
>
> capacity    0
> charge_full    1215585
> current_now    183375
> present    1
> status    Discharging
> technology    Li-ion
> temp    276
> time_to_empty_now    0
> time_to_full_now    3932100
> type    Battery
> voltage_now    2761000
>
> - -Andy
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