I corresponded to the Hobby King!
"Csoma, Dec-16 05:54 (HKT):
Dear Hobby King!
I have a questions.
This battery Turnigy nano-tech 160mah 1S 25~40C Lipo Pack (Fits Align Trex 100) (PRODUCT ID: N160.1S.25T0) compatible with the Hobbyking FP100 (WL- V911)2.4Ghz 4CH Micro Helicopter (PRODUCT ID: 326000001) ?
"an, Dec-21 19:05 (HKT):
Dear Csoma ,
Thanks for contacting the HobbyKing Support Team.
this is the correct battery
Thanks for emailing support.
If you have any other questions, please let me know.
HobbyKing Product Specialist
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Someone tried this battery? The original battery does not look like this.