Fuse for XT60 chargeport

Looking for some advice. Been procrastinating to put a fuse on the chargeport but now im determined to do it. I use a xt60 as chargeport and have a 6 amp charger. I was thinking to buy a 15 a fuse since that gives me some space if I want to upgrade to a beefier charger later. Should I go lower or higher or is 15 amps fine?

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