Amazon.com: Battery Packs Lithium Ion Battery Pack 3.7V 4400 mAh : Health & Household
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Amazon.com: 1Pcs 18650 3.7v 4400mAh 1S2P Li ion Rechargeable Battery Pack with 2.0Pin JST-PH Connector 16.28Wh/4.4A, Blue, 6.6 x 1.8 cm (19.28Wh/4.4A) : Health & Household
Amazon.com: JPOSolar 36v Lithium Battery 36 Volt 4.4ah 4400mah Battery with XT60 Plug Configuration 10S2P. with 6 Months Warranty by Factory. Made in USA : Health & Household