Check the solar panel for debris or damage blocking sunlight. Clean with a soft cloth and inspect for cracks or defects that may prevent charging. Ensure the panel is angled to receive optimal sun exposure. Solar lighting ideas like proper placement can make a big difference.
Test the battery with a multimeter. If voltage reads below 1.2V per cell, it likely needs replacing. Most solar flagpole lights use standard AA or AAA NiMH or NiCad rechargeable batteries.
Check wiring connections for any looseness, corrosion or …