[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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