Tempting to pick nits here and say no.. However the answer is YES.
WHy the no.. Well when you hook up more than one battery in parallel the "Become One" with each other and thus you end up with ONE big battery.
Same as when you put two sixes in series.
The suggestion of charging them independently THE FIRST TIME, is a good one though
But it will work just fine.
One side note.. There is a limit to the SIZE of the battery your maintenance charger can maintain... Usually you need about 1% of the 20 hour amp hour rating for the maintenance unit.. IE: 100 amp hours, 1 amp.
But there is a lot of flexibility in that ratio.
