Vivitar ViviCam 8400 - Manual (Page 54)

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The factors that influence the lifetime of the battery:

The frequency of use and time the LCD is active

The frequency of use of the flash

Quantity of image shooting

Temperature (the lifetime of the battery when the camera is used in low
temperature environment is shortened).
Note:

Do not use Manganese batteries for this camera. Alkaline batteries are
recommended.
 Don’t take out the battery when powered on. This will affect the internal
settings and functions of the camera.

The following situation will affect the lifetime of the battery:

LCD screen is on

LCD in playback status for a long time.

Please replace with new batteries when the battery level is low.

Please take out the batteries if you plan not to use the camera for a long
time.

Do not insert batteries that show signs of leakage, erosion or are inflated.
Note: if you use rechargeable batteries, please fully charge them before
using.