Cool mornings expose the batteries summer weakened. A five-minute test now beats a no-start in December.
Capacity hides until it does not
A worn battery can crank a warm engine all summer and fail the first 45-degree morning, because cold slows the chemistry while thick oil raises the cranking load. A conductance test reads the battery's real capacity in minutes, and testing the charging system at the same visit rules out an alternator quietly undercharging it.
Quick tips
- Three years old is when annual testing should start
- Slow cranking is the last warning most batteries give
- Corrosion at the terminals can mimic a dead battery — clean and retest
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