Was out on the boat yesterday and was sitting at anchor for about seven hours. Did not use genset. Refrigerator, Raytheon c80 (no radar), vhf radio and radio (nothing special), were on the whole time. Several bathroom flushes, but that’s it. Went to turn on blowers and nothing (in fact draw made c80 turn off). Checked 12v meter in the panel and when blowers were turned on needle dropped down to 8v. Refrigerator draws 4.4ah and radio etc should draw less than 2ah. Battery is about a year old. Rated at 105ah c20. Battery hydrometer (?) was showing green. I had a problem with another battery not working right out of the box and had to return it. Battery charger showed charging at 3 amps last night and is at 0 this morning. After about an hour charging back at the dock, tried battery again running blowers and refrigerator (charger off) and it held a little above 12v for 5 minutes of testing.

Any thoughts or just another bad battery?