In the last two weeks, our car's developed a new problem: about once a week, with no warning, the battery's too low to start the car. My wife (the main driver) has taken long enough trips to recharge the battery from any losses during starting, and drives the car every couple of days or daily. The battery and the charging system test OK (auto parts stores tested them), and I'm not finding any standing voltage drain - it tests at 0.02 amps of standing (everything's off) voltage drain. The top of the battery is good and clean.
What should I be looking at?
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