4 x WLtoys V931 XK K123 3.7V 720mah 25C Upgraded Battery With Charger<br /><br /><br /><br />Description:<br />Item Name:  Lipo Battery<br />Specification: 3.7V 720mAh Lipo battery<br />Cable Length: 25mm<br />Battery dimension: 4.2 x 2.5 x 0.95cm<br />Battery weight: 17.3g<br /><br />Feature:<br />Upgrade to 720mAh, longer flight.<br />Suitable for: V931 F949, XK K123<br />                      <br />Package Included:<br />1 x X4 charger<br />1 x battery  HORI<br />4 x 3.7V 720mAh Lipo battery