In Stock. Aetertek Dog Collar Battery Li-polymer Battery Fits Aetertek, At-211 Mini, At-215, At-216 7.4v, 500mah CS-SDT74SL $29.42 Quality components are important for the efficient and smooth operation of your battery. We always use the best parts. Its confusing we know, often due to certain data not being available this battery will fit models that we do not show in the current list. As this information comes to light we will update these fitments. If you are not sure as to which... Add to cart