This pack is built with a set of fully tested and matched 2nd generation Prius refurbished cells. With this option, we have confidence that you end up with a pack that is better quality than the original pack, and it is still cheaper than the dealer's option. This option is an advanced replacement, greatly limiting your down time to just the time it takes you (or your shop) to replace the battery. Your core charge is fully refunded once you return your old battery. This service comes with a 1 year / unlimited mileage warranty. Please see warranty page for details. Please note: The price quoted for shipping INCLUDES RETURN SHIPPING of your core. If you choose local pickup or installation, we will contact you to set up an appointment.