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Message: <blockquote data-quote="RockHopper" data-source="post: 3941066" data-attributes="member: 49099">2032's once a year or so, but my 123 usage is pretty high compared to many.  It was a new pair every week for the TRL-1 before I switched out to the single cell trl7. So I've halved that amount thankfully. I also stick with branded light batteries. I've used surefire a few times, but streamlight brand seem to last longer. I figured that if the same brand battery screws up the light in some way, I've got a  better chance at a warrantee replacement. Plus...streamlight branded batteries never seem to be any more expensive than the other major name brands when it comes to bulk buying.</blockquote>