Built in daylight sensor ensures the light will only operate in darkness in AUTO mode. And the batteries should have enough energy.
All batteries must be the same type as mentioned;
Do not mix alkaline, standard, or rechargeable batteries;
If battery contents are leaking, discontinue use and discard;
Do not mix old and new batteries;
Remove the batteries if they are exhausted or it should be long period unused;
If you have any doubts about the installation, seek the services of a qualified installer;