Methods Of Preventing Over-Discharge

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. 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.

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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".
When the vehicle is not going to be used over a long period of time, disconnect the battery cable from the negative terminal. (If the vehicle has an extended storage switch, turn it off.)

Courtesy of NISSAN NORTH AMERICA, INC.