After less than 12 months, the battery was empty!

Actually a nice, good clock.
I had approximately 10 years before a Casio clock. Since the Batterei had almost 6 years held until 1 exchange.
In this clock I have after about 6 months had a sudden "Reset" for now. I had to stop everything. The distances were getting shorter and shorter, until I could no longer use the wireless setting function about 2 weeks ago, so after less than one year. That's weak!
However, I got to my question at Amazon equal to a new clock sent.
One certainly could change the battery, but after less than a year one has even guarantee I thought