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 <[email protected]> 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 <[email protected]>
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.
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