NPP NP4-4Ah 4Volt 4 Amp Rechargeable Sealed Lead Acid Battery
Mighty Max Battery ML4.5-4- 4 Volt 4.5 AH, F1 Terminal Rechargeable Sealed Lead Acid 445 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
NPPower NP4-4Ah Volt 4Ah SLA Sealed Lead Acid Battery F1 Style Terminals / (2pcs)