So 2 weeks ago I had a slew of warnings, DSC Not Available, Terrain Response Not Available, Emergency Braking Not Available (or words to that effect). Truck drove fine and the warnings were gone on next start. It was cold that day. Last week I had an HDC not available warning, came on during driving, probably also cold that day, also gone on next start. I've read this can be anything from battery, to brake light switch, ground point on passenger side, to actual problem with rear locker. Since the battery is 4.5 years old, I'm assuming this is the likely cause? It starts just fine. I see that replacing with an AGM is a popular upgrade. Has anyone had these long enough now to make a lifetime comparison? I read conflicting info on how ok it is to replace a flooded battery with an AGM based on charging profiles. One I read said Odyssey AGMs should never be charged with over 14.0V, my LR4 was charging at 14.5V at startup. OTOH the LR4 has a battery management system so I think it would be compatible. The system on these trucks is frustrating - I couldn't even run the radio with the engine off for more than 5-7 minutes before it shuts down even when the battery was brand-new. That time is now down to probably 1-2 minutes which makes me think the battery is the source of the original problem. Yet the battery is still reading 12+V and starts the truck fine. I usually get at least 8 years out of a battery on my other vehicles.