2009 Lexus ES350 79,500 miles
A month ago while waiting to pick up my daughter, I had the radio on for a few minutes while the engine was off. Car would not start while all the electrical worked so had to get a jump. I tested again yesterday by leaving the radio on and the battery dies. Get another jump and start, car starts and runs fine as long as I don’t do anything with the engine off.
Volt meter reads the battery at 12.9 when the engine is off. Jumps up another 2.1 when I start the engine meaning alternator is fine too. Just in case, I bought a new battery but have yet to replace it. Voltage on a new battery reads at 12.64 which is even lower than the old one!
Should I still go ahead and replace it?