If you're just talking 24 hours of drain and the battery is discharged,
it should just charge right up using any method you have, slow charge,
50A boost then start, jump start then drive around a few miles,
anything should work. Car batteries are pretty tough. I have a 1993
Ford van that sat 6 yrs, battery sitting in a dead condition for
probably 5.5 of those in temps ranging from 110 degrees to -25. I
figured the Van dead including the battery with only 6000 miles on it.
Charged the battery, fired right up with 6 yr old gas and all. This was
2 yrs ago and battery and van still running fine. Nice to be back from
that 6 yr "vacation".