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LiPo Battery 400mAh + Best
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Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh : ID 3898 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
400mAh 3.7V Rechargeable Small Lithium Polymer Ion Battery Cells Pack - China Portable Power Bank for Laptop and 400mAh Lipo Battery price | Made-in-China.com
H31 Battery With USB charger ( Input 5V ) X4 H107 H31 Spare Parts 3.7V 400mah Lipo battery 3.7 V 400 mah 30C 752035
Rechargeable battery 3.7V 400mAh Li-Po with wires and socket