The quality of the headphones is sufficient and good. Our daughter used this along with your tablet from Samsung and there has never been this connection problems.
The battery is easy to load, even if no charger is included. Simply attach to the cell phone chargers with USB. In 1-2h the battery is charged and then plays music 3-4h. Absolutely sufficient for our purposes. Maybe longer but we have never tried longer and already loaded before the headset stopped playing ...
Highly Recommended for easy use and in my opinion better than a wired device.