[Obioban]

100% on the i3 is not 100% on the battery pack-- it has a buffer built in from the factory.

i3 battery pack is heated/cooled by the car-- so you don't really need to worry about charging it while cold. The battery pack will heat itself to be fine.

50kw DC fast charging was pretty fast for the stock 2014-2016 60aH packs, but it's not fast enough to be worrisome of the 94aH or 120aH packs. You also won't get the full 50kw of fast charging if the battery isn't warm enough (or cool enough) to accept it-- the car will limit the flow. Similarly, it will limit how fast you can accelerate if the battery isn't warm (or cool) enough to put out the power needed for more.

Really, with a later (2017+) i3, just try not to discharge the car to near zero and you should be fine. Fast charging is worse than home charging, on any EV, but it's about as inconsequential on a 120aH i3 as it will be on any EV.