There is a problem with how the firmware is controlling the battery charging. We are working on this problem and expect to have a firmware update out shortly. If you didn't purchase this product directly from us, please ensure you register your email with us to be notified when the firmware will be available.
SP3-103, SP3-102, SP3-101, SP3-100
The battery in these models is not rechargeable. You need to replace it with a AA alkaline battery. You can also use rechargeable batteries but these need to be charged outside of the SweetPea3 in a separate charger. The AC adapter does not charge the battery. It is only used to avoid using the battery, such as playing music overnight in a child's room.