It's like saying hot water freezes faster. It won't turn to ice in a faster time but it does lose more degrees per minute because the differential is greater.
Not exactly the same with batteries but charging does have to slow down at say 80% and then again at 90%, so if the bigger battery can more easily be kept below 80% then maybe it could be said it charges faster. In reality it will charge at the rate supplied by the charger big or small and the bigger it is the longer it's going to take to recharge.
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