WORWORF High Quality 18650 Rechargeable Low Temperature 2600mAh Lithium-Ion Battery Cell: The World's First to Do Both 40°C 1C Continuous Discharge / -20°C 0.2C Continuous Charge
DC 3.7V 2600mah 505573 li-ion Lithium Ion Polymer Battery Replacement for DIY Tablets Battery 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Amazon.ca: Electronics