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Amazon.com: HXJNLDC DC 3.7V 4200mah 606090 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply. : Electronics
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1S1P 3.6V (3.7V) 3500mAh 10A 18650 Battery with Wire Leads - LG MJ1 ce – Liion Wholesale Batteries