Window modules have very short memory

[LTP]

AMV8Stuart said:

I'm sure I've seen people saying that they connect a charger during the battery swap to retain settings/misfire data. Obviously care needs to be taken to ensure the live terminal when removed from the battery is isolated but sounds as though it would work.

I think it depends on the charger. There are chargers on the market that are designed to keep the car "awake" while you swap out a battery, but others (like my Ampmatic) actually sense if they are connected to a car with a battery and, if they see no battery, will automatically shut down.