After reading all the posts , i have learned a couple of things , remove the batteries after season and replace with new ones. I only had one red dot for years and it was a Bushnell TRS25 and i bet the battery is at least 10 plus years old , lucky it had not leaked or caused a problem, the battery has been removed for now.. This pass few months i have bought 1 Burris FF3 red dot and 2 Swampfox green circle dot's .. after sighting in 2 of these last week, the Swampfox Kingslayer green circle dot is my favorite. But in all fairness i like my Nikon turkey pro and Simmons pro diamond low power scopes better than these red dot's ... IMO.. but we will see i'm going to give these red dot's a try this season.