I've had to replace the battery 3 times in the last 5 years. If I start it daily, the battery will have enough juice to start; but, if the car sits and is not started for 3-4 days or more the battery will be completely drained. Car has 30k miles and is garaged 1/2 the year with occasional starts during the winter.
Why is my 01 Spyder always draining the battery dead when parked fow a few days? on 2001 Toyota MR2 Spyder
Maybe you have a battery drain somewhere