Originally Posted by Jim Schings
No. Too many variables. I would just measure the voltage on the batteries in both conditions....
I finally got around to putting a volt meter on my battery as per Jim Schings and also used ATVers suggestion.
The RV was on shore power for 5 days and the battery switch in the on position. Then it was unplugged for one day with the battery switch off and the TVs unplugged. At that point the battery voltage read 12.36 volts and the lights on the battery monitor indicated 1/3 charge.
Today, after another day of being off line and the battery switch in the off position the volts read 10.34 and the red battery lights showing empty. After that I started the engine and let it run for about five minutes and the voltage read 14.51. A previous time all the lights were lit up on the battery monitor with the engine running.
Then I turned off the engine and plugged into shore power. With the battery switch off off it showed 13.02 volts and with the battery switch on it showed 13.48 volts.
Correct me if I am wrong but I believe my battery is toast despite what my dealer claims based on their $55 battery test.
BTW, there is plenty of room in the battery box under the step for two batteries that are larger than the current group 27. A quick and not precise measurement shows 9.5 inches of height and about 28" in length.
BTW2, When we bought this RV last August among the things left by the previous owner was an unidentified strap. I saved the strap but had no idea what is was for. A couple of people at the dealership also had no clue. It matches exactly the strap that holds down the existing battery. Mystery solved.