Magnificent bird calls

With this clock, the bird songs are more beautiful, more intense and longer to hear than with my cuckoo clock of KooKoo.
However, after 3 weeks, the two responsible for the birdsong batteries were so gone "to its knees" that only the recognition of a brief peep was heard. After replacing the batteries was again all wonderful to hear. It now remains to examine whether these batteries have to be replaced as quickly or it is simply due to the quality of the batteries, so that better ones are according to purchase.