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    Isn't the battery supposed to last more than 12 months under normal conditions? The battery should also be covered by the warranty. Commented Dec 10, 2017 at 23:44
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    Good point that it might be regular battery discharge, not a defect. @PedroLobito 'normal conditions' are driving your car on regular basis. You can end up your hybrid drive with batteries discharged (20%) so a few weeks later... well, you can guess...
    – user45830
    Commented Dec 11, 2017 at 8:50
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    @PedroLobito A dead 12v battery can be caused by a vehicle defect, however a year old battery is more likely to be drained due to operator error of some sort (eg leaving lights on until it was drained) and just needs a jump start. If it won't start with a jump and/or running the engine (30+ minutes) fails to recharge it enough to start your car again then something is more likely wrong with the battery or charging system that is a warranty claim. Commented Dec 11, 2017 at 14:46
  • Battery discharge can happen if very cold weather, or/and you don't use the car often or/and only drive for 5 min ( alternator doesn't have time to charge the battery back).
    – Dupond
    Commented Dec 12, 2017 at 8:55
  • A battery should last a lot longer than 12 months, and I can't see how operator error could be to blame. Is it even possible to leave the lights on accidentally on a 2017 Prius? I would imagine the lights would turn off automatically. Commented Dec 12, 2017 at 13:15