IMPI EcoCap Rechargeable Invisible Fence Compatible Battery
Finally, there is an environmentally friendly alternative to the Invisible Fence Power Cap. The Impi EcoCap represents a break-through in battery chemical composition enabling the creation of long life, high capacity battery to operate in all Invisible Fence brand collar receivers including the R21, R22, R51 and Mircolite. The typical Invisible Fence brand collar will use 4 Power Caps per year. If purchased individually at a cost of $19 for a single Invisible Fence brand battery that's $80 per year, per dog.