Charge gets quickly exhausted

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Rapid battery exhaustion on the Nikon Coolpix L120 is most commonly caused by an incorrect battery type setting, using standard alkaline batteries, or mixing battery ages and types.

Check and resolve the issue with these steps:

1. Verify the Battery Type Setting: Press the MENU button, go to the Setup menu (☑), select Battery type, and ensure it matches the exact batteries currently in the camera (Alkaline, COOLPIX / Ni-MH, or Lithium) ¹. If this setting doesn't match your batteries, the camera will misread the voltage drop and shut down prematurely.
2. Upgrade to Ni-MH or Lithium Batteries: Standard alkaline AA batteries struggle with the high current demands of digital cameras (powering the LCD screen, zoom motor, and flash) and often drain after only a few shots. For best performance, use fresh AA lithium batteries or high-capacity Ni-MH rechargeable batteries (such as Nikon EN-MH2) ².
3. Avoid Mixing Batteries: Always replace all four batteries at the same time. Never mix old and new batteries, or combine different brands and chemistry types ³.
4. Check Battery Contacts: Inspect the metal contacts inside the battery compartment for any dirt or corrosion, and wipe them clean with a dry cotton swab if necessary.

Sources:

123 Nikon COOLPIX L120 User Manual