Learn how to replace and upgrade the hybrid battery in a generation 3 Prius (2010-2015) with this comprehensive 40-minute video tutorial. Discover how to diagnose a failing hybrid battery, remove interior components, disconnect and remove the old battery, and install upgraded cylindrical cells for improved power and regenerative braking efficiency. Follow step-by-step instructions on disassembling the battery pack, installing new cells, and reassembling the vehicle. Gain insights on using epoxy for interior panel repairs, testing the new battery, and conducting a fuel economy test drive. This detailed guide covers everything from diagnostic codes to torque specifications, ensuring you have the knowledge to get your Prius back on the road with enhanced performance.