Nite Lite NL640 Battery Replacement - UB645 Universal Sealed Lead Acid Battery (6V, 4.5Ah, 4500mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com
Amazon.com: 6V 4.5Ah SLA Replacement Battery with T1 Terminal (645) : Health & Household
Amazon.com: 6v 4ah battery
6 Volt 4.5 Ah Sealed Lead Acid Rechargeable Battery - 2 Pack | Battery Mart
ExpertPower 6 Volt 4.5 Amp Rechargeable Battery EXP645 | eBay
Amazon.com: 6 Volt 4 ah, 4.5 ah, 5 ah Sealed Rechargeable Battery F1 Terminals : Electronics
UPG 4V 4.5Ah Universal Power Group 85923 Sealed Lead Acid Battery 806593405594 | eBay
Set of 4 - 6V 4.5Ah SLA Batteries + Shipping Included