This is a generic, equivalent one, 100% compatible. This 3.7V 400mAh Replacement Li-ion battery is designed to compatible with Apple iPod Nano 2nd Gen 616-0311 P11G55-01-501.

Specifications:
* Product Type: generic/equivalent
* Battery Voltage: 3.7V
* Battery Capacity: 400mAh
* Chemistry: Li-ion
* Dimensions: 55.88 x 33.04 x 2.04mm (LxWxH)
* Condition: new, 1 Year Warranty!
* no memory effect so that you can charge battery at anytime.
* Integrated microchip prevents overcharging & lengthens battery life.

Compatible Part Numbers:
616-0311, P11G55-01-501

Compatible with the following devices:
For Apple iPod Nano 2nd Generation
For Apple iPod Nano 2nd Gen
For Apple iPod Nano 2nd Gen 2gb
For Apple iPod Nano 2nd Gen 4gb
For Apple iPod Nano 2nd Gen 8gb

Package Included:
1 x 3.7V 400mAh Replacement Battery for Apple iPod Nano 2nd Gen 616-0311 P11G55-01-501