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I suppose you could have a loose plate in the battery or something... works sometimes but shorts out one cell sometimes?
Most of the Autozone, O'Reilly, NAPA stores have "digital" testers that seem to tell more about the battery than the old "load testers" they used to use. One in the Hummer tested fine on the load test but was dead the next morning so I took it back to NAPA and a different guy put the digital tester on it and found a bad cell right away.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.