Invacare Scooter User Manual page 45

Release the battery holder strap.
Removing the batteries.
Loosen the black cable battery clamp on the negative
battery terminal with the open-ended spanner, and remove
the cable.
Loosen the red cable battery clamp on the positive battery
terminal with the open-ended spanner, and remove the
cable.
Repeat the procedure for the other battery
NOTE:
Replacing new batteries takes place in reverse order.
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