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18500 Battery Panasonic 2040mAh Li-ion Flat Top NCR18500A
Amazon.com: JESSPOW 18500 Rechargeable Batteries 4 Pack with Charger, IMR 18500 Rechargeable Li-ion Battery 1600mAh 3.7V [ for Flashlight, Solar Garden Light ] with Flat Top : Health & Household
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2x 3.7 Volt Lithium Ion INR 18500 Rechargeable Battery 1600mAh LI-ION Batteries | eBay