ok, I have some Lead Gel cell batteries that are used in solar power systems. I have 4 at 12V and 7.0 Ahours a piece. the part number is Genesis NP7-12FR I am looking for a suitable circuit to charge them. It would be nice to charge them in pairs (24V) I know that EXIT signs use a charging circuit for a Gel cell battery but the amp hour rating is different since they use a smaller battery. does anyone have a circuit that will allow me to charge these? via solar or by the grid?