Car is a 2016 Mustang GT. Original battery failed after a little over 2 years and was replaced under warranty. The replacement battery (a Motorcraft) is around 5 years old. A few weeks ago, I went to start the car after it had been sitting for a week-10 days, and all it did was the death click, click, click as I held down the START button. My voltmeter showed right around 12.1 volts at the battery, so my first thought was that the battery was a little low, but it should turn over the engine.
Anyway, I put a 10 amp charger on it, and after 20-30 minutes, the engine fired right up The on-board instrumentation showed 14-something volts, so the alternator is working. Since then I've let the car sit for a week or so twice, and it still starts fine. Instrumentation shows anywhere from mid to high 13 volts while driving.
I can't find anything on the car that would have been a drain on the battery, such as dash or interior lights like we'd find on old cars, but maybe I'm missing something. My question is should I replace the battery because it's 5 years old and it MAY have caused the problem I had? Price is $110 at Costco, so is not an issue. But I hate to replace something that may last me a few more years.
Anyway, I put a 10 amp charger on it, and after 20-30 minutes, the engine fired right up The on-board instrumentation showed 14-something volts, so the alternator is working. Since then I've let the car sit for a week or so twice, and it still starts fine. Instrumentation shows anywhere from mid to high 13 volts while driving.
I can't find anything on the car that would have been a drain on the battery, such as dash or interior lights like we'd find on old cars, but maybe I'm missing something. My question is should I replace the battery because it's 5 years old and it MAY have caused the problem I had? Price is $110 at Costco, so is not an issue. But I hate to replace something that may last me a few more years.