What charger do you have?? Not all are the same. I have an WFCO in my fifth wheel and it does not have a stir function or trickle. Just a dumb charger and there is no way to modify it. My prior two TT's had Progressive Industry chargers and for $20, you can plug in a computer chip called a "charge wizard". the charge wizard smartens up the dumb charger to allow for trickle charge as well as and importantly stirring charge for lead acid batteries. the stir is important as the high voltage keeps the plates clean. My first TT I had two Trojan t125s. They were 10 years old when I sold it and still going strong. I put 2 Trojans on my next TT and had that for 4 years. Both TTs had progressive chargers with charge wizards plugged in. Now we upgraded to a fiver and I added 2 more Trojans and will be replacing the dumb wfco, with a progressives charger that has a "wizard" built in. The wfco also doesn't go higher in the voltage hence no stir. So it depends on your charger and type of battery. My conversation is for flooded lead batteries.