You might be interested in the following post, which I found while researching which battery to buy to jump start mine: http://irobin.org/prius/startup/startup

You might be interested in the following post, which I found while researching which battery to buy to jump start mine: http://irobin.org/prius/startup/startup.html http://irobin.org/prius/startup/startup.html The required 12V startup current for a Prius turns out to be surprisingly low. The author measures it for a 2005 model directly at around 30 amp (with one test showing a brief spike to 60 amp). Based on this, I bought a pack of 10 5Ah sub C NiMH batteries for jump starting (unfortunately there is no outlet in my car park for a trickle charger).