PLaying Her Small Piano

This year's Christmas is so memorable.  I bought my baby a small piano and she really loves it.  She plays it and when it sounds, she dances.  I'm ultimately happy when I see her dancing like the dance step of WAKA-WAKA song of Shakira.  I haven't bought a new battery yet.  Right now, I'm using the battery of our remote control and sometimes it lacks power.   I need to buy a battery which has a long power.