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H31 Battery With USB charger ( Input 5V ) X4 H107 H31 Spare Parts 3.7V 400mah Lipo battery 3.7 V 400 mah 30C 752035
Amazon.co.jp: Industrial Lithium-Ion Rechargeable Battery, 3.7 V, Approx. 400 mA, Approx. 1.5 x 1.0 x 0.1 inches (37 x 26 x 4.8 mm), Pack of 1 : Electronics