Originally Posted by Shermy1987
The question is about trickle charging. But anyhow. Lead acid batteries have a reaction rate that increases at a rate of about 3 times with every increase of 10 degrees F. Therefore if the batteries are sitting out in an Air Stream, or a metal battery box over summer, the discharge rate can get high enough to reduce longevity in a matter of Months. And. Leaving for a camping trip with fully charged batteries makes a lot of sense.
Unless you have a very unusual battery, you will see about 5% / month in the hottest 3 months of the year. That will drop to < 2% pretty quickly and go to near zero in the winter. Net result is a battery that drains maybe 40% to 60% in a year. That's way longer than I can imagine somebody storing a trailer that actually I in use.
If you are a more normal person who uses the trailer a bit, you only store in the winter. Thats when the discharge rate on the batteries should be near zip. Yes it does depend on your being in an area that gets out of the 80's in the winter. In that sort of area, why store? go camping !!!!
Trickle chargers *can* damage batteries. They cost money. They need to get set up and be powered. All of those things are good reasons to avoid them if possible.
Indeed if you have batteries that are past their use by date, they have very little capacity left. They will run down in less time than functional batteries. The answer there is to watch the sales at Costco