[any] charging FreeRunner from Minty Boost

2008-11-23 Thread Matthias Apitz 

Hello,

Today I've done some tests charging my FR from the Minty Boost:

- the two AA batteries are: 2700mAh NiMH 1.2V from Varta, they have been
  fully charged and directly pulled out of the Varta charger;

- I've been waiting until battery.py showed the FR with 10% of left
  capacity;

- plugged in the Minty Boost and switched it to 500mA mode; this is the
  position X in time in the small table below;

- I watched every 30 minutes the charging process; the FR was signed in
  into cellphone network, display mainly switched off and only
  'battery.py' was running; this gives

  X + 00min  -- 10% (time to full 4.5h)
  X + 30min  -- 24%
  X + 60min  -- 39%
  X + 90min  -- 53%
  X + 120min -- 62%

  then in stopped charging, maybe because the AA batteries have been
  to low; have no item to measure them :-(

Any comments;

matthias
-- 
Matthias Apitz
Manager Technical Support - OCLC GmbH
Gruenwalder Weg 28g - 82041 Oberhaching - Germany
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e [EMAIL PROTECTED] - w http://www.oclc.org/ http://www.UnixArea.de/
b http://gurucubano.blogspot.com/

Q: What is the difference between an iPhone and an Openmoko Freerunner?
A: One works but takes away your freedom, the other is free but needs your work.

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Re: [any] charging FreeRunner from Minty Boost

2008-11-23 Thread Joerg Reisenweber 
Am So  23. November 2008 schrieb Matthias Apitz:
 
 Hello,
 
 Today I've done some tests charging my FR from the Minty Boost:
 
 - the two AA batteries are: 2700mAh NiMH 1.2V from Varta, they have been
   fully charged and directly pulled out of the Varta charger;
 
 - I've been waiting until battery.py showed the FR with 10% of left
   capacity;
 
 - plugged in the Minty Boost and switched it to 500mA mode; this is the
   position X in time in the small table below;
 
 - I watched every 30 minutes the charging process; the FR was signed in
   into cellphone network, display mainly switched off and only
   'battery.py' was running; this gives
 
   X + 00min  -- 10% (time to full 4.5h)
   X + 30min  -- 24%
   X + 60min  -- 39%
   X + 90min  -- 53%
   X + 120min -- 62%
 
   then in stopped charging, maybe because the AA batteries have been
   to low; have no item to measure them :-(
 
 Any comments;
 
   matthias

500mA * 120min = 1000mAh
* 5V (USB) = 5Wh

1.2V * 2 * 2700mAh =6.48Wh

considering efficiency of voltage converter all this looks about right

cheers
jOERG


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