1, square dance trolley speaker battery is not effectively protected, making the battery aging, can not store electricity, this situation can only be replaced with a new battery. Batteries are not very expensive, dozens of dollars can be dealt with, but you need to acquire the same voltage and current batteries, to avoid burning the stereo.
2, square dance trolley speakers completely discharged, the battery can not store electricity, especially lead-acid batteries will have this problem, encountered this problem, to professionals through the high-voltage to activate the battery, of course, there are some can not be activated. If you can't activate, you also need to high replacement batteries.