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Battery capacity in Amp-hours is written as C. This notation is most useful when talking about charging/discharging rates.
Note: most deep cycle manufacturer's rate capacity at C/20, due to Peukert effect.
If you have a 200AH battery bank then C = 200AH.
If the manufacturer recommends max charging at C/5 the rate should be at or below 40A (200/5).
If the manufacturer recommends minimum charging at C/10 the rate should be at or above 20A (200/10).
If the manufacturer recommends max discharge (load) be 3C the rate should be at or below 600A (3×200).
If the manufacturer says that Absorption stage is complete when charging current has dropped to C/100 or C/200 then the current to watch for would be 2A (200/100) or 1A (200/200).
For other than C/20 loads1):
1 Hour = .3
2 Hour = .5
3 hour = .6
4 hour = .65
5 hour = .7
6 hour = .75
8 hour = .8
10 hour = .85
12 hour = .9
16 hour = .95
20 hour = 1
24 hour = 1.05
36 hour = 1.1
72 hour = 1.25
100 hour = 1.302)