Originally Posted by handn
That's my experience also. The stock Paralax is a battery eater.
Plugging the trailer in all winter with the stock Paralax is not good. Better to take the batteries out, store them in a warm place and trickle charge them from time to time.
I think that is what has happened to me. I am having battery issues right now, they will not hold a charge. I plugged into shore power and let them charge for 24 hrs, came back, unplugged, had 13.6V. I came back after another 24 hrs, had 9.6V. I am going to check each cell with a hydrometer this weekend. Hopefully only one battery is dead.