Dead Battery

[wbrown165]

Replaced battery 2 weeks ago as original battery went dead overnight. Just now, that new battery went dead. We just drove it yesterday. Any thoughts? 2022 Outback Limited XT.

 

[Dick Foster]

Check that there are no lights like a dome light or something left on. Other than that, have it checked out as in the alternator is working etc.
It doesn't take a lot to drain a battery overnight.
Have them check the current draw with the car not running. This is done by connecting a milliampmeter between the battery and a disconnected battery cable. This is called parasitic drain and it should be very small as in a few milliamps at most. If it's more get them to find out why.

 

[bmart]

What he said. And check the charging voltage at idle and rpm. Should be ~14.3-14.8 ish.

I've heard of a lot of these problems on the newer Subarus. A quick search might get you your answer.

 

[wbrown165]

What he said. And check the charging voltage at idle and rpm. Should be ~14.3-14.8 ish.

I've heard of a lot of these problems on the newer Subarus. A quick search might get you your answer.

I did a voltage check, and it read a steady 12 volts. If it is an alternator issue, I have an extended warranty to cover the cost. Thanks for your help.

 

[bmart]

Worth noting that a meter from Harbor Freight will not likely read even close to accurate. Mine is ~2 volts off...and I threw it away.

 

[wbrown165]

Mine is not from Harbor Freight. Thanks for the warning rhought

 

[wbrown165]

Mine is not from Harbor Freight. Thanks for the warning though.

 

[Dick Foster]

Worth noting that a meter from Harbor Freight will not likely read even close to accurate. Mine is ~2 volts off...and I threw it away.

That's a lot off for a multimeter. They are typically within hundredths of a volt.

 

[bmart]

I agree. My Craftsman died. I ended up buying a Fluke. Not a ton of money and will last a lifetime.