My Concord RG35AXC just died at the 5 year mark. My mechanic and I diagnosed it to that. Went to order a new one. Spruce is saying out stock on their website till Christmas. When I called them they said all the Concorde 35 amp batteries are actually around 220 days out now for delivery. I checked with Chief. They just got a delivery today, at a premium price now. They said when this lot is extinguished their next delivery is scheduled for May. Both sales reps said they are out or long lead times on numerous items. Including oil filters, plugs, mags, mag harnesses, Garmin stuff, paint and lots of other things. So fyi. Other interesting tidbit. Chief said they stopped selling gill batteries after every other one the sold was a warranty replacement.