Why does an I3 need vented front discs?

according to the dashboard meter: regen can be about 50kw/100km (tested a few times to see how much i could get ... flat roads).

,..... will be able to put that into the battery when the battery is cold ?

I have a 2017 i3 with REX.

So far, the car has been superior.

prettig said:

according to the dashboard meter: regen can be about 50kw/100km (tested a few times to see how much i could get ... flat roads).

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I don't know which meter you're reading. The measurement would be either 50 kW of regen power or 50 kWh/100 km which would be 50 kWh of regen energy produced over 100 km. 50 kWh/100 km is impossibly high because this would require 50 kW of regen power to be produced continuously on average over 1 hour while driving at 100 km/hr. That's a very long, steep descent 50 kW of regen power seems reasonable, though.

prettig said:

,..... will be able to put that into the battery when the battery is cold ?

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i3 owners trying to DC fast charge with cold battery packs have reported being unable to reach 50 kW of charging power, so if a battery pack is cold enough, regen power would be restricted as well.