Originally Posted by 10x
The rep at lazydays told me to leave it disconnected while plugged in too. He said it will charge while I tow it.
You won't get a definitive answer here but I can tell you my opinion is
that a modern 3 stage charger like you most likely have in your new trailer
won't over charge a battery in good condition.
In other words you can leave it connected.
That part about it will charge while you tow is VERY misleading.
This is discussed here all the time! Several times a year.
Some think it will charge on the road. MY experience is that it won't
charge enough to make much difference.
See this thread about battery charging while on the road--Does the truck charge the trailer battery?
Especially note my post 6 in that thread.
Finally, I've had great luck for well over 5 years using a little Battery Tender Jr.
I disconnect my trailer batteries while in storage. I do this with a battery disconnect switch. I guess that "red key" you talk about does the same thing.
I plug in a little Battery tender Jr and leave it. My batteries are kept charged and we were able to dry camp in Pisgah National Forest last season for 5 nites.
I did run the genny on the 4th day because we'd been watching a RedBox movie on the TV each night using battery power.
I'm trying to say my 4 year old batteries are still working pretty good.
I give the battery tender credit for that.
You can buy a battery tender Jr for about $25. For any battery that's in storage
more than it's used-- my motorcycle, my truck, my trailer, my lawn tractor
in winter, I use BT jrs. I have several!! I got 4 seasons out of my last motorcycle battery this way. Most guys will tell you they have to replace their motorcycle batteries every couple years.