I wasn't able to find it on the search, so forgive me if this is already answered somewhere.

What I want to do:
I have two (2) exact same 12v deep cycle battery. My motor runs 24v so I need to connect them in series.

Is there a way for me to charge the two batteries as 12v individually but still have it connected in a series and use it as 24v all at the same time?

 

No. Not without using two 12 volt chargers at the same time.

 

If i have two individual 12v charger, then I should be okay? I have three diagrams here, which one would be the safest and most efficient to execute?

 

Third picture on the right with the two chargers.
Just make sure the chargers don't have one lead connected to the main's safety ground or you will have a short.
You do that by measuring for continuity with an ohmmeter between the main's ground and both of the output leads.

 

is it going to be a problem if they're being charged and running as 24v at the same time?
Would it also be a problem if they have different charges on them? Say one is 60% full and one is 90% full?