Petsafe PIF-275-19 - Manual (Page 12)

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level 6 will cause the Receiver Collar to revert to level 1. Refer to
the Function and Response Table to choose the Static Correction
level that best fits your pet. The Receiver Indicator Light acts as a
low battery indicator. The light will flash every 4 to 5 seconds when
battery replacement is required.
Battery Contact Verification
Remove Receiver Collar from your pet. Press the button and verify
that the LED light illuminates. If the LED light does not come on
remove the battery. Locate the metal tabs in the battery well. Gently
lift the tabs to ensure that the battery will make good contact.
Replace the battery into the Receiver Collar. Press the button and
check that the LED light illuminates.