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I don't believe you can increase charging speeds when charging via AC level 2 as the built-in charger in the car can only handle that. You would need to use a DC fast charger (up to 50kw) as the only faster option. There are people who have upgraded the battery, up to the largest 120ah version but it is very expensive as you would imagine. BMW made all 3 batteries physically the same size and you can upgrade in-place if needed.