Thanks
Sounds like I would just keep charging and using the cart until you HAVE to replace the batteries. A charger won't replace poor maintenance over 6 years, but I have noticed that when doing discharge tests, carts that have been charged with a QE seem to have a longer discharge rate. I thought I was crazy (well - relatively speaking), but still, I feel like this new charger is going to help 'maintain' good batteries longer than the older style chargers...
Save the cash and buy the batteries when you have to
Get that garage finished, so you have a place to work on your cart over the winter