[any] charging FreeRunner from Minty Boost

Joerg Reisenweber joerg at openmoko.org
Sun Nov 23 13:01:20 CET 2008


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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