Arrived at the river with keen expectations and optimism high. We had some walking to do from the parking lot so I decided to change my batteries first because they were borderline. I rotated the cover on the AT Pro and eked it out as the rubber gasket fits tightly. As soon as the cap came out the battery pack slid out, hit the parking lot and broke. No detecting for me today. I was relegated to chief digger and photographer. Before I could start, however, I had to chose carefully from the darker corners of my lexicon for the precise epithets that fit the moment and then shout them to the heavens. Lesson learned: First, I must open battery compartment over an area that can cause no trauma and, second, I will never, ever, ever, EVER, travel without a backup detector. Spent the hunt dutifully digging, snapping pics and mulling over what to buy as my emergency backup. Jens using an X-Terra 305 and she likes it but she would like to join me in water hunting. Looked at Whites PI Surf Pro but it sounds like discrimination is iffy. Will probably order up another AT Pro from Kellyco. Any input is welcome.