pavelmachek (![[info]](http://p-stat.livejournal.com/img/userinfo.gif){kind=small} pavelmachek) wrote,@ 2008-04-27 21:23:00 |
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Single AA phone charger
I have 10+ NiMH accumulators nearby, still my cellphones sometimes run out of power.
My first solution was to create pack for 4 of these, with USB connector, and charge from that. That did not work too well.
Now I got this toy... and it seems to work quite well. It also may be solution to my "1W headlamp from single battery" -- it provides ~500mA@3.6V with full accumulator. Is there some simple current limiting circuit I could use? (Regulator seems to have 5.5V max, I need 300mA for a 1W led, and it would be very nice if it was possible to limit current down to 10mA or so.)
Manufacturer says cellphone gets charged for ~1day standby from single AA, and that seems to be about right. (Actually n6230 seemed to last 1.5 days, but the test left something to be desired). I wonder how big conversion losses are: 1.5 days is definitely not full capacity of lion in n6230; and it has 700mAh li-ion ~= 2520mWh. Single NiMH should be ~2100mAh ~= 2520mWh, too...
I have 10+ NiMH accumulators nearby, still my cellphones sometimes run out of power.
My first solution was to create pack for 4 of these, with USB connector, and charge from that. That did not work too well.
Now I got this toy... and it seems to work quite well. It also may be solution to my "1W headlamp from single battery" -- it provides ~500mA@3.6V with full accumulator. Is there some simple current limiting circuit I could use? (Regulator seems to have 5.5V max, I need 300mA for a 1W led, and it would be very nice if it was possible to limit current down to 10mA or so.)
Manufacturer says cellphone gets charged for ~1day standby from single AA, and that seems to be about right. (Actually n6230 seemed to last 1.5 days, but the test left something to be desired). I wonder how big conversion losses are: 1.5 days is definitely not full capacity of lion in n6230; and it has 700mAh li-ion ~= 2520mWh. Single NiMH should be ~2100mAh ~= 2520mWh, too...
