Amazon.com: Upstart Battery Replacement Part for MK Battery ES3-12 - Replacement UB1234 Universal Sealed Lead Acid Battery (12V, 3.4Ah, 3400mAh, F1 Terminal, AGM, SLA) - Includes Two F1 to F2 Terminal Adapters :
MK 12V 60AH Gel Batteries for Electric Wheelchairs | M34 SLD G – Mobility Equipment for Less
MK MU-1 SLD M Battery 12v 34Ah Sealed Rechargeable ES33-12 | OSI Batteries