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by mikeash 3667 days ago
It both helps and hurts performance. The added weight will hurt handling and efficiency, but the increased capacity allows for increased power output. This is why the 90D has a lower 0-60 time than the 75D, for example. The new 60 has a quoted 5.5s 0-60, whereas the original 60 (which actually had a 60kWh battery) was 5.9s.