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Q:

Why does battery dies when truck sits for a couple of days? on 2008 Hummer H2

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When I hook up charger there is a faint buzzing sound coming from a small canister near the fuse box. It will buzz for a few seconds then stops.
(2) Answers
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have the battery tested (high rate discharge test and or hydrometer test)an inductive amp meter would be needed to see if there is a parasitic draw on the battery (something staying live when the ignition key is off).
Since all batteries create power by a chemical reaction, we say that the chemicals have exhausted themselves in the reactions. This would mean that a dead battery is exhausted.

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