Battery Drain

my truck is having problems starting, now that is finally getting cold, i have instaled some hella driving lights and reverse lights. i had the battery tested and could not test because only had 20% on it. they told me to see if it was pulling any from it and i tested it with it pulling 11.62 amps, i pulled off the stuff i had installed but only went down to 10.82 and that was the trailer brake controler. any help with this or if you think the battery is bad.