In my experience, the actual daily battery drain on a modern Tesla, with today's software, is much less than 1% a day. My wife's 2024 Model X was parked for 5.5 days in June, with Sentry Mode OFF, and the battery SOC dropped 1%.
Kevin > On Aug 15, 2025, at 10:11, jamie via EV <ev@lists.evdl.org> wrote: > > > Good to know. > > A de facto auto-bricking feature that kicks in after being parked for a few > months doesn't seem like a major selling point. > > For that matter, having to accept a steady 1+%/day battery drain from the > main pack doesn't seem particularly efficient. Is that typical of other > brands as well? > > Nor does forced sacrificing of the accessory battery when the main pack gets > too low. > > Couldn't some brilliant engineer do better? Perhaps design actual off > switches to delay/avoid these conditions? > > > On 8/15/25 8:29 AM, Kevin Horton via EV wrote: >> The current version of the Service Manual for my 2022 Tesla Model S has the >> following in General Information -> Charging -> General: >> Discharging the HV battery to 0% state of charge can permanently damage the >> battery. To protect against a complete discharge, the vehicle enters a low >> power consumption mode when the state of charge drops below 6%. In this >> mode, the battery stops supporting the onboard electronics to slow the >> discharge rate. >> NOTE >> When the low power consumption mode is active, the auxiliary 15V battery is >> no longer being charged and can completely discharge within hours. If this >> situation cannot be avoided, disconnect LV power (refer to procedure) from >> the vehicle to preserve the 15V battery. If a complete discharge does occur >> then the vehicle will need to be jump-started and the 15V battery must be >> replaced. >> ======= >> The Owner's Manual has the following in the Sentry Mode section: >> Sentry Mode requires your Battery to be at least 20% charged. If the Battery >> falls below 20%, Sentry Mode turns off and the mobile app sends you a >> notification. Power consumption may increase when Sentry Mode is active. >> It has the following in the Battery Care section: >> Even when Model S is not being driven, its Battery discharges very slowly to >> power the onboard electronics. The Battery can discharge at a rate of >> approximately 1% per day, though the discharge rate may vary depending on >> environmental factors (such as cold weather), vehicle configuration, and >> your selected settings on the touchscreen. Situations can arise in which you >> must leave Model S unplugged for an extended period of time (for example, at >> an airport when traveling). In these situations, keep the 1% in mind to >> ensure that you leave the Battery with a sufficient charge level. For >> example, over a two week period (14 days), the Battery may discharge by >> approximately 14%. >> Kevin >>> On Aug 15, 2025, at 8:21 AM, Collin Kidder via EV <ev@lists.evdl.org> wrote: >>> >>> Well, they do some of that. Sentry mode will disable at some point, I think >>> 30% SOC. The car won't enable those sort of "bonus" features at low SOC but >>> it seems that otherwise it's perfectly fine with trying to kill the HV >>> battery to save your $200 12V battery and still be able to run the >>> computers. That does seem to be a rather poor choice. Personally, I'd >>> rather ruin the 12v battery and leave the main HV battery at 20% or >>> something. I believe most other current EVs (Bolt, Mach-E, etc) do disable >>> pretty much everything to do with the HV battery at a certain SOC so that >>> it stays good even if that means your 12V battery has to die. >>> >>> On Thu, Aug 14, 2025 at 9:37 PM Bryce Nesbitt via EV <ev@lists.evdl.org> >>> wrote: >>> >>>> And YES this is a serious design flaw. >>>> >>>> The car could implement several battery actions: turn off sentry, camping, >>>> and eventually LTE data. Have a "battery saver" mode that wakes up >>>> once a week to call >>>> Tesla over mobile data, but that's it. >>>> _______________________________________________ >>>> Address messages to ev@lists.evdl.org >>>> No other addresses in TO and CC fields >>>> HELP: http://www.evdl.org/help/ >>>> >>>> >>> -------------- next part -------------- >>> An HTML attachment was scrubbed... >>> URL: >>> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20250815/43a9d4ec/attachment.htm> >>> _______________________________________________ >>> Address messages to ev@lists.evdl.org >>> No other addresses in TO and CC fields >>> HELP: http://www.evdl.org/help/ >>> >> _______________________________________________ >> Address messages to ev@lists.evdl.org >> No other addresses in TO and CC fields >> HELP: http://www.evdl.org/help/ > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
