MG HE Series Manual page 52

Below the procedure for connecting the power cables to the battery.
1. Remove the nut, spring washer and washer from the positive battery pole.
NOTICE:
When removing the nut and washers from the battery pole, it will become loose.
This is normal. When the cable is connected and the nut and washers are back in
place it will be tightened again.
2. Clean the battery pole and the cable lug's contact surfaces for a low resistance connection.
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Version 2.3 – 21-9-2022