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Have you discussed your battery capacity degradation with a Chevy Dealer who works on Bolts too? The rated battery capacity [energy] for a 2015 Spark EV is 18.4 kWh. The warranty for the battery is 8 years, 100K miles or more than 35% degradation - which ever comes first. 35% degradation means your battery capacity must drop below 11.96 kWh to qualify. It looks like you have already dropped below that point at 37.5% degradation per the Torque Pro numbers. I think you have a good argument for a replacement battery.