Volvo's appear to be programmed to stop charging the battery at 85%. Monitoring via a carscanner OBD dashboard shows battery state of charge always flat lines at 85% and then alternator voltage drops back accordingly.
So your battery will never hold more than 85% charge unless you put an external charger on it. Wouldn't have thought this a very clever way to treat a battery for maximum lifespan but maybe Volvo have some research into this to inform the approach (although my guess is that by treating the battery as a consumable similar to brake pads it simply allows them to put an extended life expectancy on the more expensive alternator and reduce projected whole life cost). There's probably been a past win in there for them in relation to fleet sales and maybe carbon accounting.
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