I have four small dogs and an Invisible Fence system inside and out. Buying batteries directly from Invisible Fence is pricey. These batteries are not Invisible Fence brand. They worked with three of my four collars. I tried several of the batteries in my newest collar with no luck. I thought the collar might be defective and returned to the store. The collar is fine and worked well with the brand name batteries. I probably will stick with those from now on and save myself the half hour drive and aggravation to have the collar checked.
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