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Four Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars. eBay determines this price through a machine learned model of the product's sale prices within the last 90 days. eBay determines trending price through a machine learned model of the productâs sale prices within the last 90 days.
I just put a new battery in, and the low battery light is flashing on my receiver collar.1  Take battery out for several minutes. 2  Lift tab underneath battery. 3  Replace the old battery with a new battery. 4  Make sure battery is installed properly.5  Recheck the collar. Lift tab underneath battery. 2  Replace the old battery with a new battery. 3  Make sure battery is installed properly. 4  Recheck the collar. 5  If receiver collar is still flashing, please contact our Customer Care Center to replace the receiver collar.