TOYOTA 2011 Prius - Manual (Page 67)

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1-1. Hybrid system
PRIUS_U (OM47685U) DVD
NOTICE
n Hybrid battery air vent
l Do not put foreign objects over the air vent. The hybrid battery (traction
battery) may overheat and be damaged.
l Clean the air vent regularly to prevent the hybrid battery (traction battery)
from overheating.
l Do not wet the air vent. It may cause a short circuit and damage the hybrid
battery (traction battery).
l Do not load a large amount of water such as an aquarium into the vehicle.
If water spills over the hybrid battery (traction battery), the battery may be
damaged.