Insten 3.7V Replacement Li-Ion Battery for iPod nano Keeps the music playing on your first generation iPod nano with this replacement battery. Comes with the necessary plastic tools to open up your iPod. This is a high capacity, rechargeable Li-Ion (Lithium Ion) battery with premium cell. Voltage: 3.7 V. Keeps the music playing on your first generation iPod nano with this replacement battery. This is a high capacity, rechargeable Li-Ion (Lithium Ion) battery with premium cell. Voltage: 3.7 V Dimension: 1.6" x 0.8" x 0.125" [40.64 x 20.32 x 3.18 mm]