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
UPG 6-Volt 4.5 Ah Sealed Lead Acid (SLA) AGM Rechargeable Battery UB645 - The Home Depot
840-844 R&D Batteries, Inc. 4.5 V CLOCK BATTERY : PartsSource : PartsSource - Healthcare Products and Solutions