Not NiCad, NiMH. NiMH doesn't have the old NiCad type memory effect, and the Prius battery management system doesn't have any issues with discharging/partially recharging the batteries (at least in my Gen 2 and 3 models). It does have to be said however that (as I suspect with the Ioniq), the Prius State of Charge indicator does not reflect total battery condition....All other Prii (and a couple current models) have NiCad batteries with entirely different BMS. NiCads have a memory effect that can reduce their effective capacity if only charged part way.
I had the same experience when driving down a mountain. I could feel the car shoot forward when the soc reached 100%. As a safety measure the ICE is started in order to enable engine breaking. Otherwise the brake pads might overheat if you keep on pressing the brake pedal.Once when driving down a very long mountain rd from top to bottom for miles my battery was so full it could not take a charge any more. At that time the engine started and I am guessing why here, because the charging unit got so hot and needed to cool off. But if someone really know why the car runs when it can no longer be charged I sure would love to know. https://goo.gl/maps/CumArmqFBZnN9d3z8
I was at my dealer and was informed there is a recall for programming the batteries, check recalls, this may (or may not) helpMy 2019 HEV never has gotten above 2/3 charged. Usually stays between 1/3 and 1/2 charged. Is this normal?
Currently have 3000 miles on the car, I love it, but wondering if I should be concerned. Due for service in 500 miles. Thanks