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For what it's worth, I replaced the regular Duracell batteries with a fresh pair of Duracell Ultra batteries and measured the voltage again. When the controller is turned on but not charging, these batteries initially produce 3.16V and then gradually drop to around 3.0V as they are being used. When the controller is charging the car, they initially produce around 2.8V and then gradually drop to around 2.5V.
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