Six Pack Dog Fence Batteries for Invisible Fence R21 or R51 Receiver Collars by Perimeter Technologies
Brand: Perimeter Technologies

These replacement dog fence batteries fit all Invisible Fence Brand R21, R51, or MicroLite electronic dog fence receiver collars. All Invisible Fence Computer Collar series are compatible, including Titanium, Platinum, Graphite, and Mink versions. Works in place of PowerCap Battery.

Invisible Fence brand Compatible.
Works in R21, R22, R51, & Microlite Receivers.
Less Expensive than the original.
Guaranteed to work.