Just a thought but you may want to have some 'head room' on the NiMH pack to handle modest regeneration. Normally, the car will seek a 60% SOC on the main traction battery with a maximum of 80% SOC. The 20% gap provides 'head room' for regenerative energy ... important if in a hilly or mountainous area. By maintaining a 70% SOC, you've only got 10% for energy capture. ... Just a caution.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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