REDGO 5pcs Upgraded 3.7V 600mAh 25C Lipo Rechargeable Battery for Syma X5C X5 X 5C-1 2.4G 4CH RC Quadcopter Upgraded battery offers more power, more safety and higher performance for your quad copter. Enjoy over 10 minutes flight on one charge. Build-in integrated protection circuit:Dual IC chips, with anti-shortcircuit, overcharger, overcurrent, overload protection features Compact and solid body ensures the battery more stable and shockproof 600mAh Lipo battery, pollution-free, long cycle life, and No memory effect Direct replacement battery for Syma X5 X5C 4 channel 2.4GHz RC quad copter, no modification is needed.