1S Lipo Battery 3.7V 400mAh 30C for H31 H43hw 2.4G 4CH 6Axis RC Quadcopter Drone Frame Kit Helicopter Toy Part - AliExpress
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400mAh LiPo Battery Polymer Lithium Ion Battery for Rocketry Electronics [09210] - $10.83 : Apogee Rockets, Model Rocketry Excitement Starts Here
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3.7v 400mah Original For H107 H31 Spare Parts Original Battery H31-011 Lipo Battery 3.7 V 400 Mah For H31 Xh Plug 30c 1pcs/lot - Parts & Accs - AliExpress