They are small, button batteries which I use in bore sights, to sight in my firearms. I haven't used any to the point of them starting to go dead, but so far, they keep the laser nice and bright and have allowed me to take the time to make sure that my scopes, etc. are properly sighted for the distance of my choosing. I don't have anything that I would use them in, as a constant use battery, such as a watch, etc.
How accurate was the sizing? Excellent
Please tell us about the quality of the product. Great
Was the product free of any manufacturer defects? Yes
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