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Originally Posted by stevewa
Yes, the "jump start" button allows you to use the 12v battery to minimally charge the HV battery. The charging circuit for this function appears to be enclosed in the HV battery pack, as it also provides the function of warming the HV battery to make a successful start more likely.
A fully charged 12v battery has enough capacity to run two jump-start cycles.
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Do you have some info about this? I was under the impression that it was the other way around because the HV battery pack doesn't get consumed when the vehicle is off (or in accessory) and the computer maintains the charge above 40% at all times, so it should never need a jump start. The 12v battery on the other hand is the one that will die because it's in use when the key is in accessory and the HV battery is disconnected from the 12v battery.