Coming into the 2021 25 Hours of Thunderhill Presented by Hawk Performance, Team Entropy Racing EVSR Electric Racing Team estimated it would have to swap the two 350-pound batteries every nine to 11 laps, but it ended up with an efficient 14 laps per battery change. Thunderhill Raceway set the team up with a charging station near the entrance to the track, allowing the team to shuttle the batteries back and forth using a heavy-duty cart.
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