Intermittent Vehicle Standby battery drain

[redintegra]

I park in attached garage with sentry mode off and never open the app to wake the car up but sometimes I lose 2 to 3 percent battery over the span of several hours, all in vehicle standby. In one stance the car was plugged in. I haven't figured out a pattern as to why this happens.

Any explanations or suggestions? Thanks!

 

[E90alex]

Often it’s just from the BMS recalibrating. Don’t worry about it. Sometimes it even goes up.

 

[Bp25]

Do you have lead acid 12v battery? In another thread about 12v battery, it was mentioned that when the 12v can’t hold charge, the car will wake up to charge it. Just another possibility.

 

[redintegra]

Do you have lead acid 12v battery? In another thread about 12v battery, it was mentioned that when the 12v can’t hold charge, the car will wake up to charge it. Just another possibility.

How do I check?

 

[Bp25]

How do I check?

I can’t find that thread right now but I bought this device from Amazon: QUICKLYNKS Auto Battery Monitor BM2 Bluetooth 4.0 12V Device Car Battery Tester
This shows a history graph of battery voltage and if you see frequently going up to 14v when the car is supposed to sleep, it indicates that the car is waking up to charge the 12v.
The other way is to use Tesla widget on phone (not the app) to monitor how long the car has been sleeping. I am not sure how dependable this method is.