I wanted to confirm that the 12V battery is continually being charged/maintained by the larger 85 kWh pack in my Model S (even when driving, or off and parked, not connected to any charging source). For most people, typical situations are listening to the radio/internet with the climate control on and the car not plugged in to charge. I know other threads say they did this for a long time (eg tailgating) without issue. But, I'm also planning to tap into a constant on 12V source and it will power the following: 1. A dashcam -- Blackvue 400HD -- constant on 12V to allow parking mode recording enabled 24/7. I know this draws very little current, so not worried about it per se (uses around 3W of power if I read correctly). 2. A cooler with an active peltier cooler for periodic road trips. This one made by Mobicool I got at Canadian Tire -- according to the Mobicool website these typically use a "4 A peltier cell with 12 V feed, cooling max. 15°C below ambient temperature" To do this, I have already used an add-a-circuit to tap into the frunk fusebox at the glovebox light fuse (5A) and already have the dashcam hooked to this for the last 3-4 weeks. Tonight, I have run an additional 12V accessory port (simply tapping into the same wire for the dashcam) to the trunk of the car for the cooler. The circuit for the dashcam and the cooler are protected by a 5A fuse. Having just installed it an hour ago, I obviously haven't used this yet, but will likely in the next couple of weeks. Note for the purposes of this discussion, assume I'm not terribly worried about losing driving range, but am worried about depleting the 12V battery excessively. Assume I can charge the car as needed for planned destinations. Currently when I need the Mobicool cooler, it's plugged into the standard 12V accessory port, but the disadvantage is when we are on a roadtrip with perishable items in the cooler, and we stop for dinner or go shopping, etc, the cooler shuts off when the car turns off/locks. I'd like it to keep running for an indefinite time (typical 1-2h, max 4h I think). While we haven't gone camping in a long time, I could forsee using the always on 12V port to keep groceries cool for a few DAYS at a time (24h/day) while camping. If I do this, will I come back to a non-startable Model S, or will the 12V battery be continually charged as needed by the larger drive pack, REGARDLESS of the car's current state (driving, charging, parked and not charging, etc)? Is there any way to check on the status of the 12V battery?