Synergy Digital Dog Collar Battery, Works with Dogtra 35AAAH3BMX Dog Collar, (Ni-MH, 3.6V, 210 mAh) Ultra Hi-Capacity, Compatible with Dogtra BP20R Battery - Walmart.com
Lithium Polymer Rechargeable Battery 3.7V 210 mAh PL651628-2C US Seller (2 pcs) 799705303577 | eBay