Amazon.com: NPP NP6-2.8Ah (F1, 4 Pcs) Rechargeable Sealed Lead Acid 6V 2.8Ah Battery for Attendance Machine, Security Alarm System and Mini Instrument : Health & Household
Amazon.com: Universal Power Group UPG UB645 6V 4.5AH SLA Sealed Lead Acid Battery - also Compatible with Kid Trax Disney Ride on Toy KT1123TR : Automotive
NP6-2.8Ah (2 Pcs) 6V 2.8Ah Sealed Lead Acid Rechargeable Battery F1 Terminals | eBay