60 Ah battery range degradation
Early 2014-2016 i3s use the small 60 Ah (22 kWh) battery, which loses range faster than later packs; real-world range can fall to 55-65 miles past 60k-80k miles, worse in hot climates. Ask for a battery state-of-health (SOH) reading via BMW ISTA or an OBD tool before buying, and test-drive to confirm range. BMW rarely replaces free out of warranty; a specialist pack runs about $6,500-$15,000.
Ask for repair records covering this item. If it hasn't been addressed and the car is in or near the mileage window, price the $6,500–$15,000 repair into your offer — or make it the seller's problem.