Methods Of Preventing Over-Discharge

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

The following precautions must be taken to prevent over-discharging a battery.

The battery surface (particularly its top) should always be kept clean and dry.
The terminal connections should be clean and tight.
At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as "low maintenance" and "maintenance-free".

Fig 1: Inspecting Battery Surface
Courtesy of NISSAN MOTOR CO., U.S.A.
When the vehicle is not going to be used over a long period of time, disconnect the negative battery terminal.

Fig 2: Disconnecting Negative Battery Terminal
Courtesy of NISSAN MOTOR CO., U.S.A.
Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep a close check on charge condition to prevent over-discharge.

Fig 3: Checking Charge Condition Of Battery
Courtesy of NISSAN MOTOR CO., U.S.A.