Here's a long term view of my battery voltage:
The two negative spikes were from leaving the parking heater running, and forgetting to turn the lights off.
The general decay from 100% to 80% is caused by not using the car, every blip going positive is when I used the car.
The sharp sudden rises to 100% are when I connect the battery charger.
The long periods at 100% are caused by initially charger connected and then a fair amount of driving.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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