Let's assume a lead acid car battery (12V, 50Ah, 250A output).
According to BatteryUniversity article BU-403:
The charge time is 12–16 hours and up to 36–48 hours for large stationary batteries. With higher charge currents and multi-stage charge methods, the charge time can be reduced to 8–10 hours; however, without full topping charge. Lead acid is sluggish and cannot be charged as quickly as other battery systems.
So the charging rate is no more than C/12. But car batteries (usually 6 cells) can discharge at often beyond 200A. 250A in my example. For a 50 Ah battery, this would mean discharging at a rate of 5C.
Does that mean, that a lead-acid battery can be discharged at least 60 times faster than it can be charged?
Or have I misunderstood something?