One or two leisure batteries. 70mah or 75mah (Wigmore HR6)

My hubbies powerchair (disability outdoors powered wheelchair) has a dead battery (one out of two). If you have one or both with the ability to be charged I would be grateful.
These are huge batteries, big car size, but not car batteries. They draw power differently to a car battery.
Will pick up.
Can you help with this request?
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