#1 What is the average/general life span of the battery. also how does the magnetic attachment mention in the information notes assist in securing the dash cam to the window screen
In general lithium battery will last for a couple of years, however wear and tear due to frequent charge and discharge times may affect this. The dash cam can continue to be used when powered by the USB cable regardless of the battery condition.
The magnetic attachment is between the mount and the dash cam. The mount itself is attached to the windshield using a secure 3M sticker. Therefore, the mount will be stuck firmly to the windshield, whereas the dash cam is easily removable from the mount due to the magnetic connection .