The RAV4 Prime plug-in hybrid’s electrons are stored in an 18.1-kWh battery pack, and the EPA rates its electric-only driving range at 42 miles. We were able to drive for 32 miles on electricity alone in our testing, but that was on the highway; we would expect a longer driving range in the city. On the Prime XSE, a 3.3-kWh onboard charger is standard, and a 6.6-kWh charger is optional; charging time on a 240-volt outlet is reduced to 2.5 hours. If only a 120-volt outlet is available, charging times will be approximately 12 hours.