Why won't my speaker turn on?

Hi. My JBL Charge 2+ malfunctioned when I was chopping wood in 0 degree celcius weather and listening to music. If I plug it into power socket then the power button light is always ON. If I remove it from the socket then pressing on the power button only turns the power button light on as long as I press the button. Other buttons do not respond at all. Needless to say that no music comes from the speaker. I assume it cannot be the battery problem since the battery was strong until that faithful day. Also, the speaker should still power up if it is connected to the power grid.

Please help!