This pack is a refurbished pack built using reconditioned cells from similar vehicles. This pack is thoroughly tested and balanced and comes with a 90 day / unlimited mileage warranty. Please see warranty page for details. 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. 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.