How to maintain my batteries while I wait....

ROTTEN

Hello friends.
I got my batteries and they are sitting.
my solar setup is on hold for a moment and I wanna be sure my batteries dont
go bad from sitting idle..

I have them stored inside in climate controlled shed, sitting at 70'F on wood.

they are Trojans 6 volt 300 some amp hours. 

If anyone can link me to a charger that can use to run a maintenance cycle on
each of my batteries one at a time, that would be wonderful.

Thank in advance.