We are starting to get Prius Generation 2 in for battery reconditioning. Toyota dealers and repair centers will always recommend that you purchase a new HEV battery. This will cost about $5000. Today the vehicle is worth between $8000 to $12000, so the cost is a significant part of the vehicle's valuation.
We repair the series 2 hybrid battery for $600 plus cost of cells changed at $150. If we find that the whole pack is below capacity we will recommend that the whole HEV pack be reconditioned as well. This brings the cost to $1000 plus cost of cells changed.
The cost is still significantly less than changing the whole battery.