Yeah, was going to chime in that there are 8, 10, and 12 amp versions, so be choosy.
I don't know how important it is to you to get a hold of one of the OE Delphi units. I mainly use a $180 Zencar that lets me select 6, 8, 10, 12, or 16 amps, delayed start in 2 hour increments, and dual voltage 120/240, with a convenient little LCD display to show actual input voltage, amperage, cumulative time charging, and session kWh.
Yep 8A seems ridiculously low but if you search 8 amp Delphi charger you'll get some hits showing the Input/Output data label on the back.
I'm not aware of any that went as high at 16. My 2017 came with a 12 amp but who knows if that was original to the car or something the dealership pulled out of a drawer when I purchased that car as a CPO. My new 2021 came with a 10amp unit in bubble wrap.
The Occasional Use Cable that came with our 2014 U.S. i3 when we bought it new was 12 A.
My probably faulty recollection is that BMW started including 10 A versions pretty quickly, maybe even with some or all 2015 U.S. i3's. There might have been too many melted or overheating 120 V receptacles due to the poor condition of many old, oxidized receptacles with poor wiring connections or weak springs clamping down on the plug blades.
There's a 10 A OUC being advertised for sale for $120 in the Facebook USA BMW i3 For Sale group. It's the late model version with the yellow cord. The seller is in Surprise, AZ.