My 2012 RAV EV (purchased new in November 2012) had a complete and total electrical failure last January due to my car's 12V battery inexplicably discharging to a very low level (even while actually driving the car). I was monitoring the voltage while driving with a DCV digital readout device plugged in to the cigarette lighter power socket at the time.
To best of my knowledge, based on information given on the TMS forum, 12V batteries in Tesla Model S cars are susceptible to going EOL within ~2 years from brand new. Apparently, Tesla recommends 12V battery replacement at much more frequent intervals to preclude this problem.
After having my car towed to my local Toyota dealer, and recharging the 12V battery manually, no trouble was found with the onboard charging system, but they replaced the 12V battery anyway. Me thinks there is something to the notion that Tesla drivetrains have a very high vampire load on 12V batteries, and the number of charging cycles they can withstand is really quite limited.
I have not heard of any other RAV EV premature 12V battery failures like mine, so this is just a heads up to all fellow forum members.