How To Charge Prius Auxiliary Battery. Quick video on how to check your Priuss 12v auxiliary battery voltageWeird things can happen when you have a weak auxiliary battery so best to check that fi. Turn the Prius on and drive for a minimum of 20 minutes without turning the engine off.
1 Push on the area indicated by the blue arrow and remove the fuse box cover. Though it has less all-electric range than the Chevy Volt the Prius Prime is more efficient than the Volt if you expect to be driving on a combination of gas and electricity. It allows you to boot the cars computer which runs some tests and then closes the relay on the HV battery you may hear a click from the back seat.
Unlike in a conventional car where the 12 volt battery has to supply power to the starter motor the Prius 12 volt battery has no large power demands and is therefore small and light duty.
A smaller 12 Volt auxiliary battery and the much larger high voltage Hybrid System Battery. Another incredible detail is that Toyota has a specific battery charger for the Prius auxillary battery. For all Prii the 12 volt auxiliary starting battery is located in the rear of the vehicle towards the rear of passenger compartment or trunk. Tested it works fine.
