Prius battery and car door problem?

Mark Villifana: Depending on the age of the car, the 12v aux battery may be near or at its end of life (this is not the large, hybrid high-voltage battery). The original aux battery typically lasts 3-6 years. A popular replacement is the direct-fit Optima Yellow top, which is available from elearnaid for $170 and should last 10+ years. http://www.elearnaid.com/opdsopbadifi.html (For a 2004-2009 Prius). The manual key, the metal key hidden inside the key fob, should always be able to unlock the driver's door regardless of aux battery condition. Check to make sure the "SKS" button was not accidentally pressed. On the 2nd gen Pri (2004-2009) it is located low on the dash board, below the steering column. This button disables the smart key system. Even if the 12v aux battery is too low to recognize the smart key or boot up the car, you can boot (start) it by applying 12v current from another car or 12v source to the underhood jump start terminal. It is located ins! ide the black, plastic fuse box enclosure on the driver's side of the engine compartment. Remove the black cover by pressing in or pulling up on the latches around the outside. Inside, you'll see the fuses, relays, and a red, plastic flip-lid. The terminal is under the red cover. Apply 12v + to this point and 12v - (neg) to an unpainted bolt on the body or engine. Then you should be able to power up the car. Here are instructions on how to replace the aux, 12v battery on a 2004-2009. https://www.youtube.com/watch?v=c4jw5T3LprA