BTG 500mAh 3.7V Upgrade Battery & X6 Charger for F180C JJRC H37 H6D H6C H31 Hubsan X4 H107C H107D H107L H107P H108 JXD392 388 Wltoys V939 V252 UDI U816A Walkera Super Mini Genius CP FOR SAFETY PURPOSE, PLEASE READ "CAUTION" OF THE BATTERY BEFORE USE!!! Upgrade battery for F180C JJRC H37 H6D H6C H31 Hubsan X4 H107C H107D H107L H107P H108 JXD392 388 Wltoys V939 V252 UDI U816A Walkera Super CP Mini CP Genius CP These batteries also can be used with mini FPV racing quadcopters and racer drones which support 8520 Coreless Motor!! 6 batteries with one X6 charger, can charge 6 batteries at one time! NOTE: Can't work for H107C+, H107D+