18650 Rechargeable Li-ion Battery 2200 mAh 3.7V Flat Top Rechargeable Batteries 2Pcs (the color of the outer of batteries would be random) - Newegg.com
Liitokala 30a Lii-35a 18650 Li-ion Battery 3.7 V 3500 Mah Rechargeable Li-ion High Drop Battery For Flashinglig - Rechargeable Batteries - AliExpress