Thanks for you comment. When you say you're on your second one, do you mean under warranty. Where did you purchase from? How soon did the fault manifest?
we're on our second one of these and it has the same fault, the parent unit battery charges and shows full until you link it with the baby unit then it drops to one bar. looked on Google and it's a common fault so be careful. great piece of kit otherwise though and crystal clear sound, we can hear little 'un breathing
We have this and it's brilliant. Good quality and our toddler loves the light show at bed time