This link can help. I've bought from tehse folks before and they stand behind what they sell and what they say about a product I have found is what it is when it shows up at the door.

http://www.batterystuff.com/tutorial_chargers.html

Next click on shop battery chargers on the left, select, 12 V, select 5-10 amp.

The ship and shore from earlier posts is shown, and do look at some of the Quests.

I have a BATT CAT 220 I bought at TSC over 5 years ago. It allows chrging all types of batteries (Mat, gel, flooded). Here's what a similar 3 bank chrager looks like, my 220 was a 2 bank. http://greensboro.craigslist.org/for/1630285489.html

I bought an onboard chrager because sometimes at the lake, in the rain, I got to charge batteries. I DIDN'T MOUNT IT IN THE BOAT. Instead, I cut a 12 by 12 inch of 2X12, mounted the chrager to that board, then put a carry handle on it. This way I have a portable, that can do 2 batteries at once, and can sit out in teh rain, on the boat, or dock, or in the back yard while doing its job and not be damaged. Similar charger can be had from MinnKota, as a one or 2 bank. Email me at [email protected] if you'd like me to email you a couple pictures of mine to see how its mounted and stuff.