As a point of reference, most modern AS seem to come with a 55-amp converter regardless of the battery configuration. You could look at this from the same perspective everyone gives for buying an AS, "don't buy based on the TV you have today" so don't buy a charger/converter based on the single battery you have today
If you ever convert to lithium the numbers change, in theory C/2 increases longevity...but reality is that in other applications C/1 is common, and in many uses of lithium batteries charge rate exceeds 1*C or even 2*C.