Kia Optima Hybrid 2017 Owner's Manual page 198

Regeneration
Hybrid battery is being charged by re‐
generative braking. (Wheel Battery)
Power reserve
Engine is both driving the vehicle and
charging the hybrid battery. (Engine
Wheel & Battery)
Engine generation/regeneration
The engine and regenerative braking
system charge the hybrid battery driv‐
ing deceleration. (Engine & Wheel
Battery)
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