Originally Posted by nzwasp
Oh sorry I am using my 110v house power with a battery charger before my camping trip. If there is enough sun I'll trickle charge them while camping.
Battery chargers come in different sizes, usually designated in amperes. If you have a large battery charger, like 20+ amps, you can charge these batteries overnight. If you have a little trickle charger - one or two amps - it will take days to charge.
You might find this website enlightening. The 12volt Side of Life (Part 1)