Honestly surprised by the reviews for all 5 stars! Spring. I realize these storage boxes weren't made to store GoPro batteries, it just so happens that GoPro batteries fit freely, so someone saw this as a business opportunity. There are no ribs to hold the batteries in place (like you might find in some SD card storage boxes). To reduce battery play I applied foam rubber sealant (3/8" wide x 5/16" thick) to 2 sides of the case as shown in the attached pictures. Now the batteries stay in place no matter how hard you shake the box.
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