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[quote=Anonymous]It sounds like all the posts here are talking about the high-voltage battery. Toyota hybrids have that, and also a 12V battery.

The 12V battery went bad in our 2012 Prius. The car was dead, but we were able to boost it using one of those little booster pack jump starters. The hybrid system 12V battery costs more than a regular car battery, but much less than the high-voltage battery.

The high-voltage battery went bad in our 2013 Avalon Hybrid with 140k miles while we were on vacation in Pittsburgh. Check Engine light on, PCS light flashing, Check Hybrid System displayed in the center of the dashboard. We didn't know exactly what was wrong until we got home and got the codes checked. But the car was drivable if sluggish, and we drove home using an "avoid highways" route. The engine ran continuously, and fuel mileage was lower than usual but respectable by non-hybrid standards. The energy meter showed regenerative braking, but I don't think it was actually doing that. The high-voltage battery provides the energy to start the engine, so if it had been completely dead then the car wouldn't have worked. So the battery must have dropped below Toyota's minimum specs, but still had plenty of power to crank the engine. I appreciated Toyota's failsoft design that let me drive the car home. I was even able to use S mode on the shifter to gear down while descending the steep downhills on Lincoln Highway over the mountains.

I did get the hybrid battery replaced with a new one, because the car is still in good shape and very comfortable, it may have plenty of life left in it, and I'm not sure what kind of car I want next.[/quote]

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