Amazon.com : Enerpe 7.5V Replacement Batteries for Dogwatch, Extreme & Perimeter Stubborn and Pet Stop UltraMax Receiver Dog Collars 4-Pack : Pet Supplies
Kalee 7.5v 1000mA Battery Charger (Barrel End)
Amazon.com: BATTERY PACK - 7.5V - 1000 mAH - Ni-MH for the Motorola HNN9056A : Electronics
battery D7500mAh type D 7500mAh 1.2V NI mh rechargeable battery 7.5ah 1.2V rechargeable batteries 2pcs/lot|rechargeable battery|lot lotlot ni-mh - AliExpress