EVDRIVER wrote:Why would the aux battery be dead? It is constantly charged as needed by the DC to DC, unlike an ICE car, you can sit for long periods of time with the lights or radio on without killing the aux battery because the main pack powers everything. Unless there are 12v parasitic loads on the 12v side not using the DC/DC that are relatively high the aux battery should be fine, I had a very small battery on my EV and never had an issue after long periods of no use.
In the MINI E, the accessory battery only charged when the car was "ON". If left in the accessory mode, the accessory battery will be dead in ~48 hours (I know). And you can't re start the car after the accessory battery gets jumped/charged.
Re; accessory loads, there is the Carwings cell phone, radio battery back-up, alarm system, and probably the data loggers. 40% of lost traction battery capacity will be due to temperature cycling outside of use. Nissan would be remiss not to log this data to compare against actual battery life.