Fresh air to ... the battery ?

[comptiger5000]

Tollo - Many vehicles use temperature compensated charging to avoid that problem. My Jeep has a temp sensor in the battery tray to monitor battery temp. In hot summer weather, the voltmeter sits around 13.8 or so normally, a little less if the engine bay is really heat-soaked. In cold winter weather, it's around 14 - 14.1 due to the colder battery.

[tollo]

Originally Posted by comptiger5000

Tollo - Many vehicles use temperature compensated charging to avoid that problem.

I think some vehicles use temperature compensated charging and many does not. ... (I might be also wrong) How common is it ?

High temperature damage battery even when temperature compensated charging is used. (cool or "room temperature" is better)

euromodder - Cold temperature lowers the capacity of the battery. You won't probably not see any difference in battery voltage if you don't have temperature compensated charger.

Cold battery has less energy loss. That is the reason for better total FE.

[euromodder]

I've left a gap in my grill block, right where the intake to the battery is located.

Photo

[Frank Lee]

It's so common I've never heard/read/seen it before