Hi juan,I wen't through some battery greif,here's what i did,It worked good for me.I went boaters world,got a 1000 cranking amp marine starting battery,Then i got the largest deep cycle i could find.Here's the best thing i did, i got an inboard charger,i got a pro sport charger made by pro marine.Now all i got to do is plug it in when i'm done.It charges your lowest battery 1st.It keeps them fully charged and maintained.I got mine at cabelas for under a 100.00 This way i never have to use a conventional charger again.
thanks the runt