Hi, sorry to hear about your son's battery in his Pleo. First of all, it could be the battery, you may need a new one, esp if it is an original green one. If it is just the battery dying, then that is the good news. On the other hand, since he is "an original" have you had him for a long time? If so, it could be the Pleo is "wearing out" of old age. I have an original Pleo, Argyle who is also blind and can not open his mouth. Argyle also is having problems even with a New battery in that he makes strange sounds and his movenments are very slow and his tail will not be in sync with how fast it should be and almost stop and start. Does that sound familiar? Of course there are other possibilities and I think the very best answer would be if you could post a short video of a fully charged battery in your son's Pleo, that would give the best result to what the problem may be. RWM