[Clarky98]

The AGM's o0n my 4100 open are Northstar AGM31's and NS is no longer in business.    The batteries charge up nice but can't hold the charge for more than a couple/few hours with the inverter turned on.   Since NS has been out of biz for four years, I am assuming the batteries are older than that.   Wondering is a switch to Lithium would make sense.   Able to do this without having to change my charging system or is it easier to just replace the AGM's with Interstate or some other brand.