2, the general portable audio has two sockets, one is AUX, with grounding sign; One is DC5V with headset logo.
3. Which socket can be charged? DC5, of course. This sign means DC 5V, which is the charging port. AUX is an audio input port and cannot be used for charging. When charging, directly plug the output end of the charger into the DC5V port, and it will be full in three or four hours.
4. Portable stereos have USB cable when you buy them. What's the use? USB cable is a charging cable, which can be connected to a computer host for charging. If it is not convenient for the host to charge, it is necessary to equip an adapter, plug the USB terminal into the adapter, or charge.
5. It needs to be turned off when charging. If it is a lithium battery, it can be used at the same time. If it's a nickel-chromium battery and a nickel-hydrogen battery, it won't work. Because both of these batteries have memory characteristics, batteries are easy to break down. But even if it is a lithium battery, if you listen to it while charging, the sound effect will not be as good as usual, and it will produce current sound.
6. You need to turn on the switch when charging, and you don't need to turn on the switch when charging USB speakers. Because you turn on the switch, the speaker will be automatically converted into an external power supply, and most of the electricity will be directly supplied to the audio itself, so the battery will not be charged too much. When the speaker is turned off, the current will directly charge the battery.
7. Let's talk about the indicator light. If the charging indicator is red, it should be green or yellow when it is full. Or flash when charging, and stay bright when fully charged. If there is no indicator light, it can basically be disconnected after charging for 4 hours.