Dirk52
lvl.4
Flight distance : 232995 ft
Germany
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Adomolis Posted at 2017-8-3 04:52
Can someone explain to me (im not an electrician ) but how can a Spark battery which is 1450mah consume 6600mah? I tried using the 5000mah power bank and indeed it only charged spark to around 80% of its full capacity and drained my whole pb. Where does the waste go? Is this healthy enough for Sparks battery?
The spark is not a 5V device like your powerbank. It uses 3cells of a lipo which is 11,4V. So you get 1480mAh at 11,4V. (But charging is until 4.3V/cell so 12.9V)
You can calculate the energy of your powerbank or the sparks battery when multiply Volt and Amps.
1000mA = 1A.
5A Powerbank * 5V = 25Wh.
1,48A Battery * 11,4V = 16,78Wh.
So you can charge (theoretical, there is a loss about 40% because of the effiency 0,8·0,8 = 0,64 = 64%) nearly 1,5 times the spark battery with a 5V 5000mAh powerbank.
Calculated with the efficeny from battery to battery charging you Need about 26Wh to Charge the battery 1 time. Now your powerbank got not really 5000mA maybe only 4200mAh.
Then it is 4,2A*5V = 21Wh.
21Wh(real energy of your Powerbank) / 26Wh(needed engery for 100% spark battery incl. loss caused by effiency) = 0,81 times. So about 80% like you said |
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