Cars - For Car Enthusiasts

3955 readers

1 users here now

About Community

c/Cars is the largest automotive enthusiast community on Lemmy and the fediverse. We're your central hub for vehicle-related discussion, industry news, reviews, projects, DIY guides, advice, stories, and more.

Rules

Stay respectful to the community, hold civil discussions, even when others hold opinions that may differ from yours.

This is not an NSFW community, and any such content will not be tolerated.

Policy, not politics! Policy discussions revolve around the concept; political discussions revolve around the individual, party, association, etc. We only allow POLICY discussions and political discussions should go to c/politics.

Must be related to cars, anything that does not have connection to cars will be considered spam/irrelevant and is subject to removal.

founded 2 years ago

MODERATORS

BallShapedMan

RightHandOfIkaros

Why do even hybrid cars have 2 batteries?(12v + high-voltage) (self.cars)

submitted 1 year ago by Monero to c/cars

7 comments fedilink hide all child comments

It feels kind if dumb to see such configuration and I have worries If I drain small 12v battery by using car with engine off It wouldn't start..

you are viewing a single comment's thread
view the rest of the comments

[–] FlyingSquid 6 points 1 year ago (1 children)

Huh.

The 12v battery in a hybrid doesn’t start the car like you’d expect – it provides power to the computer, relays, ECU, etc. The heavy lifting of starting the engine is actually done by the hybrid battery.

I knew about the rest of the things it does because I can run my stereo and my headlights on my Prius without the battery indicator dropping. But I totally thought it also started the car.

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago)

Well in a technical sense you are also right, since the contactor for the main battery gets power from the 12v (albeit it's not a big load) Meaning if the 12v is completely dead the hv battery will not switch on and the motor will not start.