Same problem on my 2017 V60 . replaced both batteries , worked for a few days then back to square one . I think it is just a flawed system . When it did work on a trip down to Devon I counted how many times it operated , 36 times ! . Worked out that cost of the extra wear on the starter & battery far outweighed any fuel saving . And as the engine will work a bit harder after a start/stop to recharge the battery , the anti polution argument fails as well . I just live without it now .
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