Panasonic NCR18650B 1000mAh Li-ion Battery 3.7V (2 Pcs) (Copy)

From the shop's description

Specifications Symbol: 18650 Type: Li-ion battery Actual capacity: 1000 mAh Rated Voltage: 3.7V Charge Voltage: 4.2V Diameter: 18.5 mm Height: 65 mm Note: The battery has no protection from overcharging and deep discharging. For charging, it is best to use a charger for the microprocessor. Do not charge above 4.2 V or discharge below 2.5 V.