SPARE SWAPPABLE RECHARGEABLE BATTERY FOR JBL EONONE-MK2 n nEasily swappable rechargeable battery provides 6 hours of play time at full volume. Spare rechargeable batteries are handy if using the EONONE-MK2 in a remote location on battery for more than 6 hours a day. n nThe battery is integrated into a column spacer to improve stability and to optimise the cabinet acoustic volume for superior low-frequency response. n nVariable Power Performance automatically optimises the audio power performance to provide 4 dB higher output when connected to an AC source: 123 dB peak SPL using AC power, 119 dB peak using battery power n