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Battery Drain

Basicbob

Member
Oct 14, 2020
65
2
London
Hi

I’ve had my model 3 for 5 months and I didn’t have a problem with the battery until now.

I charged the car on Sunday and got it to 61%. Overnight it dropped to 55% which is not normal as I car drains 1% overnight maximum.
I checked the usual stuff like sentry mode and it’s all off including heated seats and AC.

I got into the car this morning and the battery was 40% I did use the car over the let few days but only for local mileage max 20 miles over the last 4 days.

I’ve checked the energy usage over 15 miles and I’m using 200watts per mile which I think is great.

the software is updated. any ideas on what I can do?

would a hard reset make any difference?
 

Cloggie

Member
Nov 18, 2020
131
62
West Midlands, UK
@Basicbob That sounds like a lot of loss, unfortunately it can be impossible to find the reason going by other people's experience.
A hard reset after a software update is something I always do and it has solved some minor issues in the past. I have never had the battery drain you are describing though.
 

Alan J

Member
Jun 17, 2019
201
110
Glasgow
Might be worth checking that you haven't accidentally enabled battery precondition for scheduled departure, I managed to do that myself a while back and had a similar experience, disabled it and all well now.
 

jmaddr

Member
Mar 29, 2019
919
929
Florida
I was in the same predicament. I checked sentry, cabin overheat protection, scheduled departure, and didn't find anything that would cause my drop. I use Teslamate to log "state" and found I was constantly coming out of sleep at the same time each morning (around 740) which would indicate the car coming out of sleep for pre-conditioning but even with that disabled, I couldn't get it to stop. Further, I noticed it coming out of sleep every few hours and stay awake for a few hours at a time when, before, it would sleep for 12 hours or more each time.

I went the nuclear route, I factory reset it. No more issues. YMMV.
 

Wol747

Member
Aug 26, 2017
844
355
Tea Gardens
It seems to be a common thing now.
I have a suspicion that the 12v battery is calling for a snack all the time and the car wakes up to feed it.
 

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