How do i recharge my battery with an ac adapter again?

Hey all. It's been a while since I've gone out fishing as my question shows but I'm gearing up to head out for a paddle tomorrow with the wife. I want to recharge my two identical batteries (one is this http://www.cabelas.com/prod-1/0036388018049a.shtml and the other is essentially the same but different brand). I can't seem to find the ac adapter I used to use or else the one I have in front of me had the contacts ripped off of it. So what I have is a 1000mA 12v adapter. Is this too high amperage to hook up to my batteries? I see from searching on here that most of you use 500mA chargers. Do I risk blowing my battery up or do I just have to take it off after a short time?

If what you have is a "smart charger",  1000mah or 1amp chargers are in your battery size range .8-10amp.
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2518

Thanks but its actually not a "charger". It's a plain old ac adapter. I take whatever connector is on it and snip it off and split the line and then attach a male wire connector (1/4" which matches the battery tabs) and hook it on and plug it in. It has no settings nor timers. I simply left it on for a certain amount of time I believe. I found a 550 mA adapter after posting this and decided to sacrifice it for my kayaks and snipped it and did what I described.

I'm still curious about how long to charge with my 1000 mA charger though if anyone has ever tried that or knows about it?