It's not gonna explode.
Like I also use Bluetooth audio, occasionally forget to unplug, it has been charged for two days, it is OK, it is still good to use.
Don't believe that kind of false rumors, Bluetooth speakers generally have automatic charging protection devices. But the speaker should be well protected.
The ambient temperature used in audio should be controlled at least between -10 ° C and 40 ° C, and the temperature environment should avoid large fluctuations as far as possible. Excessive temperature changes and the use of sound in extremely low and extremely high environments will cause irreversible damage to the sound system.