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The problem with NiMH chemistry is that voltage is a poor indicator of SoC, and it's also temperature dependent. Can't remember if the hCH1 does, but the Insight actually counts current in and out to try and further refine the estimate.
The car is reasonably smart. A long sustained climb that pulls the SoC down is going to have the car decreasing the EV assist until it reaches 0 to protect the battery.
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