Marshall Bluetooth speakers are wired and unlimited charging two power supply methods, normal access to the home power supply charging, if it is outdoor use, and the speaker itself does not have a charging function, you can buy a large-capacity outdoor battery for its power supply, the method is to fully charge the battery, get outside and then use the speaker power line to insert the outdoor battery, the above two ways will not harm the battery.
It's charging from the USB port! However, if the battery is not used for a long time, it will damage the battery and may not be able to charge again!