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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> Battery Common Causes of Malfunction >> Battery Protection During Vehicle Storage

Battery Protection During Vehicle Storage

Certain devices on the vehicle maintain a small continuous current drain on the battery. A battery that is not used for an extended period of time will discharge. Eventually permanent damage will result. Discharged batteries will also freeze in cold weather. Refer to Battery Inspection/Test .

In order to maintain a battery state of charge while storing the vehicle for more than 30 days:

    IMPORTANT: If a green dot is not visible in the hydrometer, charge the battery. Refer to Battery Charging .
  1. Ensure that the green dot is visible in the built-in hydrometer.
  2. CAUTION: Refer to BATTERY DISCONNECT CAUTION .
  3. Disconnect the battery ground to protect the battery from discharge by parasitic current drains.

When the battery cannot be disconnected:

  1. Maintain a high state of charge.
  2. Establish a regular schedule for recharging the battery every 20-45 days.

A battery that has remained in a discharged state for a long period of time is difficult to recharge or may be permanently damaged.