I bought a total of ten pieces, in order to supply the JVC RV NB 70 BE BoomBlaster. Equipped with the battery it came to the festival. After some time you have wondered why the music did not stop playing. But she ran and ran and ran. After about 16-20 hours listening to music, to half volume and varying Bass, the Akuus but finally went out of juice. The price is justified quite steep but in the power of the batteries and their impeccable finish.
A good charger is also worthwhile to purchase.
For a product that could really convince me completely, then there are also five star!