1. Battery Item specifics ：

 Brand Name: For Sanyo 

Model:  2600ZY

Type:  Li-Ion 18650
Nominal Capacity:  2600mah（2500-2600mah）

Nominal Voltage:  3.7V

Weight:  45g±1g

Rechargeable Battery:  Yes

Rechargeable Times:  Up to 500 times

internal resistance:  ≤50mΩ

Limited Charge Voltage:  4.2v

Working Voltage:  2.75-4.2V
Size:  65.5mm x 18.5mm (Diameter)

Place of Origin:  JAPAN