36 volt lithium batteries cannot be used directly in square dance speakers with a voltage of 15 volts. If used, the speaker will be immediately blown (the fuse may be burned first). If your 36-volt lithium battery is a combination type (three sets of 12-volt lithium batteries), you can try using a set of 12-volt lithium batteries directly to see if you can start the stereo.
The difference is in the operating voltage. The operating voltage of 15 strings is 48 volts and the operating voltage of 16 strings is 51 volts.
The upper limit of the lithium iron phosphate battery charging voltage is 3.7 ~ 4V, and the lower limit of discharge is 2 ~ 2.5 V. The upper limit of the operating voltage is 3.60. ~3.65V, and the lower voltage limit is 2.2V~2.5V. If 15 channels soundt used, the working voltage range is: 37V ~ 54V, which shows that the lower limit voltage of the battery of 48 volts is a little lower. In order to increase the lower limit of the 48 volt battery, a chain was added. That's why the 48 Volt 16 String Lithium Iron Phosphate Battery!