The UnderGround – Compatible R21-R51 Dog Collar Battery works with the dog collars used in several of the Invisible Fence® brands. This battery lasts as long or longer than the original Invisible Fence Brand PowerCap batteries. The battery is compatible with Invisible Fence Brand R21, R51 and MicroLite electronic dog fence receiver collars. The chief engineer at the Invisible Fence Company approved the design of the battery. The batteries are manufactured in a state of the art facility in Pennsylvania under his supervision.
UnderGround – Compatible R21-R51 Dog Collar Battery compatible with following Invisible Fence® brands:
- R21- Invisible Fence® Brand R21
- R22- Invisible Fence® Brand R22
- Microlite – Invisible Fence® Brand Microlite