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Q: Battery dies when car parked

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Battery becomes very weak after being parked more than approximately 4 hours. Can still start after 3 - 10 tries, usually closer to 3 - 4 tries, if sits up to 24 hrs. After that highly questionable if will start. If sits a couple of days will not start - battery dead. Removing cable connection and then reconnecting just before drive helps, but not entirely. Will most often start but takes a number of tries. If don't drive for 2 or 3 days will not start if cable connected and may not start if cable not connected. Possibly connected to fuel pump or something else to do with the fuel. Have noticed it starting better when tank is full or not sure but if use better quality gas. Have not been able to find any obvious drains on battery like a light staying on. If drive a couple of miles, battery will hold charge for a good two plus hrs. No problem starting. Any longer battery begins to weaken. Also, car had continued to run after removing key. Think this has stopped since using better gas.

My car has 180000 miles.
My car has an automatic transmission.

A: Hi there. Your vehicle battery becomes weak...

Hi there. Your vehicle battery becomes weak, may just be a bad battery. The hard starting, may just be slow cranking RPM. Being able to drive a few miles and the battery will hold a few hours, leads me to believe the alternator is working. There could be a parasitic draw on the battery from a shorted or active component. I recommend having your vehicle's battery issue diagnosed and repaired by a certified technician, such as one from YourMechanic.

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