The video above shows you how to replace the battery in your 2010 Toyota Prius. We recommend changing the battery in Toyotas every 4 years. Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your Prius that you need to replace.
If you Prius came without Smart-key and without the Navigation system the Prius comes with a smaller battery, S34B20R or Toyota part number 2880021181 or 2880021180. The battery tray is also smaller and it can be a tight fit.