get the battery tested first to check it's a duff battery, most decent battery places will do this FOC
Can't comment on best battery for A8 other than Bosch S5 usually well rated, and usually get a 5 year warranty with Bosch, I think
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2002 Mark's D2 S8 FE [Joint 1st Place Winner at 2025 Owners' Meet]
2025 Hyundai Ioniq 5 N
2020 BMW M340d xDrive
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