Power Portable 18500 3.7 Volt Rechargeable Li-ion Battery - 4-Pack with Top (1400 mAh) - Walmart.com
Duracell 18500 3.2-Volt Rechargeable Lithium Landscape Lighting Batteries in the Landscape Lighting Batteries department at Lowes.com
3.7v 18500 1400 Mah 1500 Mah 1600 Mah 1900 Mah Battery Cell Rechargeable Lithium Batteries For Led Lamp Holder Li Ion - Buy 3.7v 18500 1400 Mah 1500 Mah 1600 Mah 1900