A:Answer Hi Babydoll, Thanks for much for the question. The SRSXB32 is designed to reduce the maximum volume to about half when the remaining built-in battery power becomes less than 10% in order to protect the circuit due to extreme voltage or current fluctuation by using at a loud volume. Even in this case, you can charge the built-in battery, but the volume does not return to the normal. To return the volume to the normal, charge the built-in battery until the remaining built-in battery power reaches 20% or more, turn off the speaker and turn it on again, and then adjust the volume. Hoping this helps, and thank you for choosing Sony! ~Earl
