Note: If your sound is flashing red, it may be the battery loss will lock the motherboard, replace the new battery, need to go to the Bose official website to upgrade the sound, (generally plug in will give a prompt sound, if there is no prompt sound motherboard problem is bigger), if it is the problem of the motherboard, please go to the professional repair shop for repair
Attention!!!Battery does not come with Circuit Board, guests need to DIY welding connection!Note: ❌Our battery does not have connecting wires and control board❌Please check carefully