Near Excellent -- but not enough surface area on bottom to establish contact!!!
Overall quality is near excellent.  What held back the 5 stars is the design at the bottom.  In some devices, the AA battery doesn't have enough surface area to make contact and so will not work (example:  Coleman LED lamps).  To workaround this, you may use a penny or some aluminum foil.  If the designer would simply design something to mitigate this, that would make this a 5 star product.
Rating: 4 stars