18500 li-ion Battery 3.7V 1400Mah ICR18500 Lithium Rechargeable Battery for LED Flashlights 6pcs(They are not 18 * 65mm Size Battery Also not aa Size Battery) : Amazon.ca: Health & Personal Care
UltraFire BRC 18650 4000mAh 3.7V Li-ion With PCB Battery (2-pack)