Original Liter energy battery ICR 18500 Battery 3.7V 1600mAh li-ion Rechargeable Battery - AliExpress
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HQRP Battery 4-Pack 1200mAh IFR-18500 18500 3.2v LiFePO4 Lithium Phosphate compatible with Solar Garden Landscape Patio Light Spotlight Rechargeable Button Top without PCB 52mm - Walmart.com
Duracell 18500 3.2-Volt Rechargeable Lithium Landscape Lighting Batteries in the Landscape Lighting Batteries department at Lowes.com
Taken 18500 Rechargeable Batteries, IMR 18500 1500mAh 3.7V Li-ion Rechargeable Battery with Button Top - 4 Pack