I recently replaced the battery in my 2018 Subaru outback and the new battery is measuring 12.41-12.45 volts after sitting overnight. I checked again after two nights and it was reading the same. Shouldn't it be closer to 12.5 volts? The old battery died because I replaced a burnt out side maker bulb (and the bulb on the opposite side of the car) with LEDs causing the lights on climate controls to stay on. I never noticed they were staying on and don't understand why this would happen, but according to posts on other forums it happens. As soon as I swapped back to new halogen bulbs the lights on the climate controls turned off, but the battery wouldn't hold a charge. I got a new battery from Costco and have been checking it just to make sure nothing else is going on. Thank you for any input.
LEDs pull less current and have different internal resistance than halogen bulbs and that apparently confuses the computer on those cars.
At 12.41 volts a standard-type lead-acid battery is about 80% charged. What is the voltage immediately after the car is turned off? You might want to have the charging system load tested.
Thank you for your response. The voltage I saw right when the car was turned of was 12.6-12.7. The voltage when I first start the car is around 14v.
I tested for parasitic draw, I set my multimeter to 20m and it read 0.06.
I assume you measured 60 milliamps, which is almost nothing and wouldn't drain the battery overnight.
Anyway if your car starts everyday then I wouldn't worry about it too much.