With the Prius you can
With the Prius you can replace the traction battery yourself to save money and there are guides on Youtube. Sometimes people can get remanufactured Prius batteries for $1000 or less. Who knows how easy it would be to replace the battery in the Jetta Hybrid. The battery should last 10+years with a gradual drop in capacity, which might be transparent as VW might use software to not fully charge and discharge the battery as it is, to extend battery life and if they are smart they would let the battery drain and charge to wider percentages as the battery gets old to wring what's left of the life out of it. Probably would not last as long as 20 years.