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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.
Asker's rating. Report Abuse. Car batteries operate at 12 volts, whereas most electric fence batteries are 6 VOLTS, or a Lantern battery. Your system was designed to operate on a 6 volt, from the sound of it, and this is why a 12 volt car battery will not fit, or work, with it.Yes, you need to protect the battery and shield it from rain and the elements, or you will short out your fence quickly the first time there is a thunderstorm or heavy rain.his unit attaches to the electric tape/wire. It has the battery attachments, plus a separate wire that needs earthing (I normally attach mine to a metal stake that is in the ground-this works fine unless it is very dry and the stake needs to be quite deep in the ground for sufficient earthing).