So we have a charger outputting V volts and I Amperes and two rechargable batteries of the same capacity Q coulombs but different emf's V1&V2.
Which battery would charge faster?
So since the charge stored in both the batteries is Q C, and the battery provides a current of I, which is ICsec so the time taken should be the same in both the cases. (QIsec).
However the power provided by the adapter in both the cases is the same and the energy stored in the battery is different in both the cases so this answer is not possible.
Where did I go wrong?