7.4V 4000mAh 2S 50C Reaction 2.0 Hardcase LiPo Battery: EC3
https://www.ludingtonhobbies.com/shop/dynb402596h3-7-4v-4000mah-2s-50c-reaction-2-0-hardcase-lipo-battery-ec3-14202
https://www.ludingtonhobbies.com/web/image/product.template/14202/image_1920?unique=19c6995
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Manufacturer's Part #: DYNB402596H3