TheGriffinSpark wrote:do I send the car back or tolerate the reduced capacity?
I would have still bought the Spark knowing this, I love the car. If it were my only vehicle, for my particular situation (62 mile round trip commute, rural area), I would have looked at a PHEV (or more likely a BMW i3 REX). The Sparks power, efficiency, and price availability, is really unmatched.
I reiterate, I have to charge to 100% everyday when using 110/220v charging or I'm using fast charging, in order to do my commute. Additionally, I often do more than a dozen hard launches (+100kw on the gauge cluster) a day. I bought the Spark exactly 10 months ago today, and have put 19,850 miles on it (36,300 on the odo), almost 2,000 miles a month. The car would likely be significantly happier with an owner doing the opposite (while treating the car within the guidelines of the warranty, I'm pretty sure I'm a worst case scenario owner).
*IF* battery degradation keeps the same pace, the battery could be replaced under warranty in around 2 more years of my use. No-one REALLY knows what will happen, so I'm happy to drive it and find out.
I hope this has given some food for thought. The Spark, knowingly or unknowingly, makes an excellent ecological and economical choice, as a primary or secondary vehicle for many drivers, including myself.