Product:

Battery for Apple iPod. Use this battery as a replacement or a spare battery for your device. The battery is designed for a precise fit. 

 Features: 

Designed to fit your device
3.7V Lithium-ion battery
Integrated microchip to prevent overcharging
Battery operation time depends on various factors, such as:
signal strength
transmitting power level
frequency of use
Battery is sent out with little or no power. Please charge prior to use.
Specifications:

Brand: Generic (non-OEM)
Condition: Brand New
Power Rating: 375mAh
Quantity: 1
Package Includes: 

1 x Battery for Apple iPod
Compatible with:

Apple iPod Nano (1st Generation) Series: 1GB, 2GB, 4GB