Amazon.com: Synergy Digital Dog Collar Batteries, Compatible with Dogwatch R9 Dog Collar, (Lithium, 3.6V, 1200 mAh), Replacement for Eternacell B9696T Battery, Combo-Pack Includes: 2 x COMP-4-SAFT Batteries : Health & Household
Amazon.com: USB Rechargeable AAA Batteries by Pale Blue, Lithium Ion 1.5v 600 mAh, Charges Under 1 Hour, Over 1000 Cycles, 4-in-1 USB-A to USB-C Charging Cable, LED Charge Indicator, 4-Pack : Health
Amazon.com: Amazon Basics 8-Pack AAA Alkaline High-Performance Batteries, 1.5 Volt, 10-Year Shelf Life : Health & Household