No rear battery under rear seat?

[Davexxxx]

A friend was over yesterday. He has a 2021 F150 XL 5.0. 4x4 long bed, crew cab. 30 some K miles and has had zero problems.

There is no battery under the rear seat.

I didn't think to check the size of his engine cranking battery.

Is it only the powerboosts that have the extra battery, or is it something to do with the options level, 12" screen, other engine compartments have enough room to do just one big one?

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[RickBullotta]

Yes, only Powerboosts have it.

 

[Davexxxx]

Yes, only Powerboosts have it.

Then there must be a why.

 

[RickBullotta]

Then there must be a why.

It is used to power some of the electrical systems in the truck (not the starter) when the hybrid system transitions between different modes and when starting/restarting the ICE.

 

[12Lariat21]

It's not only the powerboost's my ICE truck has one. But I do have the 2kW propower so it may be just tied with that somehow...

 

[DarienAL]

I also have pro power and have it...

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