If the battery of your Smart Baby Monitor is expanding, it means that it has reached the end of its life. To change your battery, please use a standard rechargeable lithium-ion battery 3.7V 1100mAh 4.0Wh.
Note that we no longer carry the Smart Baby Monitor. As such, we do not have extra batteries available.
We recommend you to remove the battery of your Smart Baby Monitor when the device is connected to the mains power source.