The price I found a bit hefty, but thought to myself, "Okay, Western taste.".
Is charged via the 2mm connector of a normal Nokia charger. After attaching the charging cable to the phone pressing once on the button and there you go.
But very troublesome is the fact that there is (at least in the Nokia C6-00) after a relatively short time ceases to charge the phone. Although according to the description about 1 full loads should be in there, would the machine not cough up all of it - even after reconnection and operation of the knob (although still charge is present).
All in all a good idea, the high price it is with these problems but not worth it - better to buy a replacement battery and take (= 1/3 of the price!)