I have an original AIBO. Left it on its charger, off, for a prolonged period after getting a real dog. Once the new puppy had acclimated to his new home after a

I have an original AIBO. Left it on its charger, off, for a prolonged period after getting a real dog. Once the new puppy had acclimated to his new home after a month, I turned AIBO on. O. M. G. New puppy freaked out. So badly I never turned it on again. Imagine how you would react if your chair just started wandering around by itself. Several dogs later, AIBO sits nearby - in want of a functioning battery. Anyone have pointers on finding original AIBO batteries?