How to determine USB speakers built-in battery low power?
USB SPEAKER can carry it anywhere you can play, because the USB SPEAKER an inset lithium battery, generally able to use inset lithium battery playing 4-5 hours, but sometimes players will be no time to listen music, and Then there is time and then play, so in the end do not know how long before the already used, so how to know the USB SPEAKER inset lithium battery power left? Have the following methods can be judged:
When use the U-disk and SD card play songs.the USB SPEAKER voice open to the maximum, playback when fully charged than the sound become smaller. Because inset lithium battery voltage is not enough, USB SPEAKER amplifier inside the IC power supply not be enough, while the output power will be smaller, so speaker is whispering.When the USB SPEAKER peak sound, there will be numb sound Ma tone phenomenon, because the inset lithium battery voltage is not enough, the voice of the peak because of insufficient supply of electricity distortion, so the sound tone hemp.
If the USB SPEAKER shown in front of the power lamps, for example, some have blue led, some are red, then when inset lithium battery when the battery is not enough to sound amplification, that the size of the lantern with the voice brighten and dark, because the power amplifier (amplifier) circuit, if the sound is large, IC needs more current, then the LED indicator light will be insufficient supply voltage dimmed. If the LED has been very dark, no sound output, then the battery has been exhausted, and need to recharge, the general is not enough if the battery charge when necessary, do not run out of time to recharge the battery, so battery life would be affected.
