More autonomy, less bass

I use it for three weeks now and I am satisfied. Good sound despite a lack of bass for my music. An autonomy of 15 hours at moderate volume is possible and if the volume is low, or if the enclosure is connected to the phone or tablet with a cable Jack male / male. What use several days by using it an hour a day. The colors are pretty friendly. For me, it also miss the buttons on the speaker to set the previous or next music because it's faster than going out your phone or tablet to change music.
Anyway, if you look for a Bluetooth speaker with great autonomy and not too low, then this is the perfect enclosure plus a small resistance to splashing water (not submersible ...).