tbod said:
I wrote a little script to log track my battery usage...
Nice one! And how do you do that? Battery is very important to me, because I want to take the tablet with me while travelling without having to charge all of a sudden.
For you, and any others who might be interested, here is my little script...
Code:
BATDIR=/sys/devices/platform/battery.0/power_supply/battery/
cd $BATDIR
while `true`
do
echo `date` : `cat capacity`
sleep 67
done
As I say, nothing special, all it does is print the date and time followed by the current battery capacity, sleep for 67 seconds then do it all again.
It is stored on my sdcard as
/sdcard/Batt and I run it in the background with the output redirected to a file thus:
Code:
/sdcard/Batt >/sdcard/BattLog &
My most useful figures have been obtained thus:
1. Fully charging the battery, starting the script and running the tablet until the battery dies (discharge profile).
followed by:
2. Plugging in the charger, starting the script and leaving it until the batteries are fully charged (charging profile).
I wrote this script after I published my blog, the figures there were taken on an
ad hoc basis, which can be found
here.
I hope this helps you plan your usage better.
And do you have more tips that improve battery life?
Nothing spectacular:
1. Don't use WiFi unless you have to as this seems to be a major drain on the battery.
2. The same applies to the 3G modem although, from observation, this seems to use a lot less power.
3. Use headphones rather than the internal speakers not only do you get a better sound but as they sound louder the volume can be set lower.
4. Have the screen blank after 30 seconds. If you are using the tablet the screen won't blank, if you're not it will save the battery.
Regards
tbod