You have a Tesla Powerwall 3 and you receive the message in the Tesla app saying, "Calibration in Progress". This appears an App Alert Banner saying, "Powerwall (charging, discharging, idle) to improve performance".
This is normal and within Tesla's technical specification for the Powerwall 3. As the battery chemistry has changed from Powerwall 2 to Powerwall 3 (LFP) - Tesla will initially require this to be done in the early stages of the rollout with the expectation for the need to calibrate to reduce over time.
Tesla advise the Powerwall 3 must periodically undergo routine calibration for optimal battery performance. Some things to note during this calibration include:
- Calibration may take up to 24 hours
- Powerwall may discharge past your backup reserve
- Powerwall may not charge from solar
- Powerwall is still ready to back up your home during grid outages
Below is an example how the message is displayed in the app.
