Eveready® Super Heavy-Duty 6-Volt Battery at Menards®
PetSafe® 6 Volt Replacement Battery | Battery sizes, Battery, Bark control collar
Amazon.com: POWERSTAR US Battery US2200 XC2, 6 Volt, 232 Amp Hours, GC2 Group Size, 4 Pack : Automotive
Amazon.com: Trojan T-605 6V 210Ah Flooded Lead Acid GC2 Deep Cycle Battery x4 : Automotive
Mighty Max Battery ML4-6- 6 Volt 4.5 AH, F1 Terminal Rechargeable Sealed Lead Acid 645 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com