truCELL (1050mAh) Rechargeable Replacement Spare Battery with Extended Life- Works for GOgroove SonaWAVE BX , SonaVERSE BX , SonaWAVE 3 , SonaVERSE BXL & BlueSYNC SRC Portable Speaker Systems Replacement (or additional) battery for your GOgroove SonaWAVE BX , SonaVERSE BX , SonaWAVE 3 , SonaVERSE BXL & BlueSYNC SRC Portable Speaker Systems Rechargeable battery provides hours of audio playback! Specifications: Voltage 3.7V (volts); Capacity 1050 mAh Chemistry: Lithium Ion Rechargeable Long-lasting extended life will keep your music or audio playing for hours