1, the situation is that the battery is not charged into the electricity. When charging the audio control panel switch to the charging mode, in order to charge into the electricity.
2, is that you buy the outdoor audio inside the battery is refurbished batteries, can not store electricity;
3, audio battery over-discharge, or business long time no maintenance, can not store electricity, this situation requires a long time to charge the activation of the battery, if you can not activate, then the battery can not store electricity, you need to replace the new battery.
4, audio motherboard is bad, need to find manufacturers to replace the new motherboard, general audio motherboard have warranty.
Good luck.