Is it a lithium battery? A single lithium battery is in the range of 2.7-4.3 volts,2.7 is the minimum discharge voltage,4,3 is the upper charging voltage on the protection board, and the nominal is 4.1 volts (4.2 volts is rare).
Lithium battery start current is 7\/10 capacity, so it is 56A, this value is too scary, and unsafe, so choose 10A, so 8 hours can reach more than 80% of the capacity, no longer,5A can also, even 1A can, but the time is longer, in order to safety to use a charger with temperature sensing.
In fact, no matter how much capacity lithium battery is required to be filled in 8 hours. But your value is too large, you must find a professional lithium charger.