New? Hybrid behavior discovered?

[Mavster Mechanic]

Today was 100°F.
Maverick sat in a hot parking lot all day. So started out with a "warm" battery.

Did ~40 miles of freeway.
End of route has a long (3-4 mile) downhill stretch. Usually with stopped traffic at the bottom. This is one of the rare cases I sometime hit "L" button to slow down.

Discovered no regen at all coasting in L when HV battery was 118°F , 119°F, 120°F.

Worked normally at 117°F.

The odd behavior was:
Normal strength of regen at 120°F using the brake pedal. Just none or too little to detect when coasting in L. Engine brake did work and was instantaneous from the L button press with a low (35%) HV battery. Battery SOC did not climb braking in L in this scenario.

We can't say the battery reached a limit and was protecting itself. Full regen occurred with brake pedal application.
(Was looking at amps on scangauge so I'm sure.)

So it's more of a "compromise" than a hard limit.

I was able to repeat the experiment three times today with consist behaviors.

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[SteveM]

I've noticed this too with my 2025 Lariat Hybrid AWD.

 

[BomberBuck]

From earlier discussions...


At ambient temp of 114°F the computer will restrict the use of the HVB to preserve it's health.

https://www.mavericktruckclub.com/o...erature-limits-of-the-maverick-hybrid-engine/

 

[HeyBales]

Hmmm - so another case of just cause an action when the switch is hit, because we assume it'll be worse.

Like the engineers figured Low mode when that hot could be too prone and easy to just pile on the regen.

But they figured if you are braking - eh, you'll be changing the rate and won't last as long so let it go.

The manual does suggest using Low mode for downhill sections - perhaps a way to mitigate that advice when too hot.

Curious for your compare between ICE braking and regen when it normally does work on this stretch.

Is the ICE braking as capable as Low mode max regen on that section?

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