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Fenix ARB-L14-1600U Protected Button-Top USB Rechargeable 14500 Batteries (2-Pack) with Micro-USB Charging Cable - Walmart.com
Amazon.com: Replacement Compatible with Battery Custom Battery Pack 14500/750/3.7V : Health & Household
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Tenergy 14500 Unprotected Li-Ion Flat Top Battery
What You Need to Know About the 14500 Lithium Battery -