Kia Optima Hybrid 2020 Owner's Manual page 41

ENERGY FLOW HYBRID/PLUG-IN HYBRID VEHICLE (CONT.)
Regeneration
Hybrid battery is being charged by
regenerative braking.
(Wheel ➞ Battery)
H34
Engine Brake
OJFHPQ018047L
The vehicle is slowed down by
engine compression.
(Wheel ➞ Engine)
Power Reserve
OJFHPQ018050L
Engine is both driving the vehicle
and charging the hybrid battery.
(Engine ➞ Wheel & Battery)
OJFHPQ018048L