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A battery that's good when parked but dead in the morning is a "parasitic drain" — something is drawing power when the car is off. Diagnose with a multimeter, not by replacing the battery.
In our network we see these in roughly this order. Diagnostic comes first — never authorise a repair without a written diagnostic report.
Most common cause on otherwise-healthy cars. Even a 50mA constant draw kills a battery in 2 weeks of non-use.
Battery drains overnight AND charges weakly when running. Alternator load test confirms — replacement: ₹4,500-12,000.
A door-lock module, infotainment system, or BCM that won't go to sleep. Diagnosis requires draw-amperage scan on each circuit — a 1-hour job at most workshops.
Lead-acid batteries lose capacity after 4-5 years. If yours is old, replace before chasing electrical ghosts.
2-3 weeks for a healthy battery on a healthy car. Less if you have parasitic drain. EVs lose 12V auxiliary battery in 30-60 days of non-use.
Yes — disconnecting the negative terminal stops parasitic drain entirely. Useful if you're away for 2+ months. Beware: some cars need to relearn idle / window settings after reconnection.
Battery test (load test, 30 sec): tells you battery state. Alternator output test (engine running): tells you charging. Most workshops do both for free.
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