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Amazon.com: 3.7V 21700 Rechargeable Batteries 5000mAh Battery for Flashlights, Toy Car (2 Pack) : Health & Household
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Amazon.com: WBwissblue i2 18650 21700 Battery Charger Set, Universal Smart Charger 2 Bay Battery Charger for Rechargeable Batteries 18650 21700 26650 and 1.2V AA AAA (2*pcs Battery Flat top Included,2500mAh) : Electronics
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