I have not started my Prius 2016 for almost 4 months while traveling for work. Today, my neighbor tried to help to start the car. What she got is the weak buzz sound, but can't start the car. Now she can't stop the sound. When she left the car, the car beeped! So now all she can do is to leave the key in the car. I am wondering if this is related to the 12v battery? Now how do we stop the sound? Maybe just leave it alone for a few hours so it can be completely dead? I still have another month before returning. I am thinking once I am back, I should jump start the car, then go to AutoZone or others to check my battery? Does this sound like a reasonable plan? thank you all so much for help!