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CR123A and rechargeable substitutes
Nitecore 18350 3.7V 700MAH 16340 Rechargeable Li-Ion Battery Button Top | The Warehouse
16340 Batteries
Let's Talk Batteries! Probably the Most Confusing Topic--But Most Important! - Fenix Store
3.7V 18650 Charger Li-ion Battery USB Independent Charging Portable 18350 16340 14500 Battery Charger Two slots | Walmart Canada